For young men of age 20, there have been 150 rounds of DNA replication during sperm production as compared to only 23 rounds for a woman of age 20. That is a 6.5-fold greater number of cell divisions and proportionately greater opportunity for new point mutations. Yet, on average, 20-year-old men contribute only about twice as many new point mutations to their offspring as do women. How can you explain this discrepancy

Answers

Answer 1

Answer:

A plausible hypothesis is that deleterious germline mutations in sperm cells are removed by natural selection since sperms have to compete to fertilize the egg

Explanation:

Sperm cells need to travel through the cervix in order to reach the uterus and fertilize the egg. During this process (which is called 'fertilization'), approximately 300 million sperm cells have to compete in a race to reach an egg. During fertilization, the majority of sperm cells die off quickly because male germinal cells carry mutations that lead to abnormalities (e.g., many sperms have double heads, others no tail, etc). The sperm cells are considered to be physiologically weak because their normal functions can be easily disrupted by mutations and, simultaneously, they are under strong selective pressure to be selected during the sperm race. In consequence, deleterious germline male mutations are expected to be eliminated by natural selection, thereby sperms are selected before fertilization so only the strongest ones can compete in the race to fuse with the egg cell and thus develop one zygote.


Related Questions

a person has a cardiac output of 4.9L per minute. the stroke volume of each heart beat is 70 ML

Answers

that's true

stroke volume is the volume of blood pumped by each ventricle per beat

cardiac output is the blood pumped by ventricles per minute

Is that a question or a statement?

What happens during S phase?

O A. Chromosomes are duplicated.

O B. DNA separates into two nuclei.

O C. The cell splits in two.

O D. Cytoplasm is manufactured.

Answers

Answer: A. Chromosomes are duplicated.

Explanation: This is the correct answer on the quiz.

Chromosomes are duplicated in S phase. Therefore, option (A) is correct.

What do you mean by S phase?

Between G1 phase and G2 phase, DNA replication takes place during S phase of the cell cycle. The processes that take place during S-phase are tightly controlled and highly conserved.

The cell replicates its genetic material entirely during the S phase of DNA synthesis; At the end of S phase, a normal diploid somatic cell with a DNA complement of 2N acquires a DNA complement of 4N.

DNA synthesis or replication occurs during the S phase of the cell cycle, which occurs prior to the interphase. Before entering mitosis or meiosis, the cell's genetic material is replicated in this manner, leaving enough DNA for daughter cells to divide.

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What happens if a cell goes through metastasis?

Answers

Answer:

In metastasis, cancer cells break away from where they first formed (primary cancer), travel through the blood or lymph system, and form new tumors (metastatic tumors) in other parts of the body. The metastatic tumor is the same type of cancer as the primary tumor.

Is the Use of energy to move particles against the concentration gradient

Answers

Answer:

During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.

which of these sources add water to lakes

Answers

Answer:

what are the sources bff

Explanation:

Answer:

Rain runoff, groundwater, melting snow.

Explanation:

Rain flows through various paths and goes into lakes, carrying various types of small leaves or soil particles along with it into the lake.

Groundwater can also form lakes and is the source of freshwater.

The melting snow is also the source of freshwater that flows and reaches the nearby ponds or lakes present in the nearby areas.

Question 23 of 32
The diagram below represents the time a cell spends in the two main phases
of the cell cycle. In which phase does a cell spend more time?
O A. Meiosis
B. Prophase
C. Interphase
O D. Mitosis

Answers

Interphase is the answer to your question

girl is that mold on your screen?

PLEASE NEED HELP ASAP!!! What statement is true about energy and matter in stars? Select the correct answers.
A. Some matter is converted into energy within stars.

B. Energy in stars causes the fusion of light elements.

C. All energy is converted into matter in stars.


D. Energy and matter are both conserved in stars.

E. Only energy is conserved within stars.

F. Only matter is conserved within stars.

Answers

Answer:

I think the answer is A

Explanation:

I would wait for someone else to answer though.

What is the best way to test a hypothesis?
Group of answer choices

design and perform an experiment

create a large spreadsheet with all your data on it

do lots of research

ask scientists, then make an educated guess

Answers

Designing and performing an experiment is the best way to test a hypothesis.

What is a Hypothesis?

This is defined as a proposed explanation about a particular phenomenon or occurrence.

Performing experiments helps to test if the hypothesis if it is valid or not which is why option A was chosen.

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This organ stores the main metal ion that forms part
of the red blood cell. Which ion is this, and what
molecule is it a part of inside the red blood cell?

Answers

Answer:

a. Iron (Fe) ion

b. Haemoglobin

Explanation:

Red blood cells (RBC), also known as erythrocytes, are one of the cells found in the blood. Red blood cells are the major components of the blood involved with the transport of oxygen throughout the body. Red blood cells are able to do this because they contain proteinous molecules called HAEMOGLOBIN.

Haemoglobin is a molecule that contains hemic iron groups. Haemoglobin is composed of an IRON ION at the core of its structure, which binds to oxygen atom. Hence, according to this question, haemoglobin is a proteinous molecule that contains iron-binding heme groups in the red blood cells.


3. What are the two processes underlying this image that turn peat into coal?
A. Lignitigation and coalification
B. Petrification and coalification
C. Peatification and lignitigation
D. Peatification and coalification

Answers

Explanation:

D. Peatification and coalification is the answer

hope this helps you

have a nice day:)

Answer:D. Peatification and coalification is the answer

hope this helps you

Explanation:


Describe the life cycle
of mosquito and cockroach

Answers

Answer:

the cockroach life cycle is comprised of three developmental phases, the egg, nymph and the adult stage. Most cockroaches are oviparous — their young grow in eggs outside of the mother's body. ... These nymphs will feed and go through a series of moultings over a period of one year as they develop into adults

The description of life cycle of mosquito and cockroach is that the cockroach life cycle has been comprised of three developmental phases, the egg, nymph and the adult stage. Most cockroaches are oviparous it means they lay eggs and their young ones grow in the eggs outside the mother's body. These nymphs will be feed and go through a series of the moultings over a period of one year as they develop into adults.

What is oviparous?

Oviparous is the animals that lay eggs as their young ones and  Most cockroaches are oviparous it means they lay eggs and their young ones grow in the eggs outside the mother's body. These nymphs will be feed and go through a series of the moultings over a period of one year as they develop into adults.

Genetic mutation, crossing over during meiosis, polypoidy is an example of a cause of natural variation to the mechanism of natural selection. Variation shown in many ways such as physical appearance, metabolism, reproduction, fertility behavior, learning and mental ability, such variation is called as natural variation.

Therefore, The description of life cycle of mosquito and cockroach is that the cockroach life cycle has been comprised of three developmental phases, the egg, nymph and the adult stage. Most cockroaches are oviparous it means they lay eggs and their young ones grow in the eggs outside the mother's body. These nymphs will be feed and go through a series of the moultings over a period of one year as they develop into adults.

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omplete the passage to describe the function of the heart.

The pumping of the heart involves the alternate contraction and relaxation of the chambers of the heart. The upper chambers of the heart are called
, and the lower chambers of the heart are called
.

Answers

Answer:

The pumping of the heart involves the alternate contraction and relaxation of the chambers of the heart. The upper chambers of the heart are called at atria and the lower chambers of the heart are called ventricles.

help needed asap please :(

Answers

Answer: its the top one

Why there is a variation of weather in two different parts of India, though climate
was summer?

Answers

Answer:

Due to distance from the equator.

Explanation:

There is a variation of weather in two different parts of India, though climate  was summer because both parts experience different amount of sunlight. There are some regions in India which is located on the equator so they experience very hot weather while on the other hand, some regions are present at a large distance from the equator so direct sunlight does not occur and the temperature is moderately warm.

Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible? (1 point)
O Metals have low electronegativity, so they are conductive because they pass charges easily.
OTwo metals bonded together are going to be more conductive than a metal bonded with a nonmetal.
O The bonds can shift because valence electrons are held loosely and move freely.
O An attraction between a positive charge and a negative charge is created.

Answers

The correct answer is;  Metals have low electronegativity, so they are conductive because they pass charges easily.

Metals are found towards the left hand side in the periodic table. They are known for their low electronegativity. Metals are electropositive. This means that they loose charges(electrons) easily.

A metallic bond is comprised of positively charged metallic ions and a sea of electrons.These electrons can move freely.

This sea of electrons are the charges that are responsible for the properties of metals such as high conductivity.

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ASAP A group of specialized cells working together to perform a function is a(n) ____________.
A. Tissue
B. Cell
C. Organ
D. Organ system

Answers

Answer:

THE answer is gonna be A.Tissue

This is the Answer for your question :-)

I hope you are having a great day :-)

I think the answer is A. Hope this helps!

Name two organs that are made up of all four tissues?

Answers

i believe the heart and lungs are 2 organs made up of 2 or more tissues

Heart and lungs are the  two organs that are made up of all four tissues.     secretion, movement, strength, excretion and communication are the main functions of tissues.

What are tissues in human body?

Tissues are the same type of group of cells which have the same structure and functions together in a unit. Connective tissue, epithelial tissue, muscular tissue, and nerve tissue are the four fundamental forms of tissue. Other tissues are held together and supported by connective tissue bone, blood, and lymph tissues.

All body surfaces are covered in epithelial tissues, which also line bodily cavities and hollow organs and make up the majority of glandular tissue. Connective tissues are presents in the blood cells in the human body. Loose connective tissue, adipose tissue, dense fibrous connective tissue, elastic connective tissue, cartilage, osseous tissue, and blood are further more tissues in the body.

Thus, Heart and lungs are the  two organs that are made up of all four tissues.    

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match each term to its definition
a steam of plasma

Answers

Answer:

The solar wind is a plasma, a stream of charged particles (ions and electrons) that are continuously escaping from the Sun into the interplanetary medium.

draw a flowchart showcasing the process of scientific learning .also mention a short description of each of the step in the chart. ​

Answers

Answer:

The scientific method is a system of exploring the world around us, asking and answering questions, and making predictions. Scientists use the scientific method because it is objective and based on evidence. A hypothesis is fundamental to the scientific method. A hypothesis can take the form of an explanation or a prediction. There are several ways to break down the steps of the scientific method, but it always involves forming a hypothesis, testing the hypothesis, and determining whether or not the hypothesis is correct. If the hypothesis is rejected, this does not mean the experiment was a failure. In fact, if you proposed a null hypothesis (the easiest to test), rejecting the hypothesis may be sufficient to state the results. Sometimes, if the hypothesis is rejected, you reformulate the hypothesis or discard it and then go back to the experimentation stage.

The process of scientific learning refers to the various steps via which one can examine and study our environment to understand it. Once understanding or know-how is achieved, then technology is said to have advanced further.

It starts with making observations. Now because of the limitation of our senses, it is important not to jump to conclusions. The next step is to form a hypothesis based on the observation madeWhen you have arrived at a hypothesis, you can now carry out a controlled experiment where you collect further data and reach conclusions based on the experimentIf the hypothesis is in line with your observation, you publish resultsIf the hypothesis is null, you also publish results, then review your hypothesis  and repeat the experiment

All the above require consistent documentation at each stage. Please see the attached image for the flowchart.

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Why is a control group important in a scientific experiment?
Group of answer choices

It gives the scientist control over WHEN to change variables.

It is a comparison to the group where variables are changing.

It gives the scientist control over WHICH variables to change during the experiment.

It is the group where variables are changing so it controls the results of the experiment.

Answers

Explanation:

because it allows you to eliminate or isolate variable/ it allows the experiment to minimize the changes in all the variables except the one being test.

I'm not gonna choose bc I'm not 100% sure either so read what's above, think it over and choose wisely

hope I helped a little and good luck :)

Whch part of reproductive system produces semen​

Answers

The answer is Testicles (testes)

Describe an equation which is the summary of the process by which a mesophlly cell gives out oxygen.

Answers

Answer:

An equation is math so i dont really know

Explanation:

Dude im sorry im just trying get some racks

Vaccines are
1 point
cures for pathogens
prevent pathogen infection
used to treat a bacterial infection
100% effective

Answers

Answer:

To prevent a pathogen infection

What is the potential disadvanatges of external digestion

Answers

Answer:

Environmental hazards such as predators reduce the change if surviving into adulthood, Large amounts of gametes go unfertilised and wasted, Not guaranteed that sperm will come in contact with eggs, Greater chance of desiccation of gametes/zygotes.

Explanation:

Bees mainly eat the nectar of flowers and in the process get pollen all over their leg hairs, which gets carried to the next flower, pollinating them. This is an example of ___________.
A. Conditioning
B. Predator-prey
C. Mutualism
D. Parasitism

Answers

Answer:

C

Explanation:

The process of pollination is an example of mutualism. Thus, the correct option is C.

What is Mutualism?

Mutualism may be defined as a +,+ interaction in which both species may be benefitted when living together.

During the process of pollination, the host plant will receive the service of insects to provoke the pollination successfully while in return insects get the food (nectar) and space to live on the plant's flower.

Therefore, the process of pollination is an example of mutualism. Thus, the correct option is C.

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How do people get natural dye.?
I am thinking that are from trees but I am not sure pls help me​

Answers

Answer:

people can get first from anything really

Explanation:

plants like lavander can give a slight purple color and etc

Indigo plants ;And woad is to make violet and blue dyes

What's the common ecosystem of a Paramecium aurelia

Answers

Answer:

Paramecium live in aquatic environments, usually in stagnant, warm water. The species Paramecium bursaria forms symbiotic relationships with green algae. The algae live in its cytoplasm. Algal photosynthesis provides a food source for Paramecium.

Based on the information in the graph, what is the best conclusion to draw
about Africa?
World Population Growth
20,000
10,000
World
5,000
Asia
2,000
Africa
1,000
Europe
WANIA
500
200
100
United States,
Canada, and Greenland
Mexico,
Central America, Caribbean Islands,
and South America
Oceania (Australia and
nearby islands in the Pacific)
50
20
10
1950
1960
1970
A. The fertility rate is very low.
1980
1990
2000
2010
2020
2030
2040
2050
B. It has reached its carrying capacity.
C. The birthrate is higher than the death rate.
oc
D. It has few resources.

Answers

The correct answer is C. The birthrate is higher than the death rate.

Explanation

The graph is about the growth of the world population, this shows the population growth of the world, Asia, Africa, Europe, United States, Canada and Greenland, Mexico, Central America, Caribbean Islands, and South America, and Oceania (Australia and nearby islands in the Pacific). This graph covers the time from 1950 to 2050 divided into decades. In the specific case of Africa in 1950 it had a population of close to 300 million people. Subsequently, in 2010 the population of Africa was close to 1 billion people and the projection for the year 2050 is 2 billion people. According to this, it can be concluded that the birth rate is higher than the death rate because the population has a growth trend, which indicates that more people are born than die.

Which inference can you make about why finches have adapted different beak sizes and shapes? (1 point)
They are different species.
O They live in the same location.
O They eat different foods.
O They have a wide range of variation

Answers

Finches have adapted different beak sizes and shapes because they eat different foods. So the correct option is C.

What is natural selection?

Natural selection is a mechanism for evolution to happen. It is the process by which living organisms acquire certain characters according to their needs.

It is important to understand natural selection to understand the essential concepts of the processes by which living organisms have been able to develop the complex structures which are helped them to survive.

Natural selection results from various conditions of environment, ecosystem and heredity. An example of natural selection is the development of antimicrobial resistance to pathogens.

Finches are known to have developed different sizes and shapes of beaks according to the kind of food that they eat. If they fed on insects, they had long and pointed beaks. If they fed on seeds and nuts, they had broad and blunt beaks.

Therefore the correct option is B.

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Cross-contamination of food occurs when a. perishable foods are kept at room temperature for more than 2 hours b. a utensil contaminated with a microorganism from a previously handled food contacts a second food c. two or more food handlers work on the same food d. two or more microorganisms grow in the same food

Answers

ANSWER: B

explanation: from what I learned in culinary arts, this is kind of a trick question. Its not asking how foods can get contaminated, its asking how CROSS CONTAMINATION can occur. Cross contamination occurs in three ways think of it like this: food-to-food, equipment-to-food, and people-to-food. The answer has to be between B and C. But the answer is B, because the utensil is already contaminated and it is coming in contact with another food. The two or more food handlers working on the same food are not bringing anything contaminated into the situation. Unless they are contaminated (by they I mean their hands lol) then it cross contaminates but that's not it lol im 99% sure the answer Is B.

Cross-contamination of food occurs when two or more foods come into contact with each other, transferring microorganisms from one food to another. This can happen in a number of ways, including direct contact, contact with a contaminated surface or utensil, contact with a contaminated food handler, or contact with airborne microorganisms.

What is the most common type of  cross-contamination ?

The most common type of cross-contamination is direct contact, which can occur when one food touches another. This is especially true of perishable foods, which should not be kept at room temperature for more than two hours.

If they are kept at room temperature longer than this, bacteria and other microorganisms can quickly multiply, potentially leading to cross-contamination.

Another common way for cross-contamination to occur is through contact with a contaminated surface or utensil. If a utensil that has been used to handle a food contaminated with microorganisms comes into contact with a second food, the microorganisms can transfer to the second food and cause cross-contamination.

Similarly, if two or more food handlers work on the same food, their hands can transfer microorganisms from one food to another, leading to cross-contamination. Finally, if two or more microorganisms grow in the same food, they can interact with each other and potentially cause cross-contamination.

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What amount of SeC16 is needed to produce 4.45 mol of chlorine gas in thereaction Seclo +0 218) SeO, +3Cl2te)?2.85 mol0.95 mol5.70 mol8.55 mol1.49 mol You play a game where you roll a single die. You pay $1 to play, and the payouts are $0.50 if you roll aneven number, $2 if you roll a 1, and $1 if you roll a 3 or 5.2. What are the odds for winning money if you play this game? Show your work and Explain.dan3. What is the expected value of this game? Show your work and Explain what the results mean. HELP PLEASE ASAP FAST use quadratic formula to solve the following equation May somebody help with this and show how you solved these 4 problems?? Who is the protagonist in this story?Select one:O a. Mr. Martino b. James ThurberO c. Mrs. BarrowsO d. Mr. Fitweiler You would like to have enough money saved to receive $80,000 per year in perpetuity after retirement for you and your heirs. How much would you need to have saved in your retirement fund to achieve this goal A box with a square base and no top is to be made from a square piece of carboard by cutting 4 in. squares from each corner and folding up the sides. The box is to hold 1444 in3. How big a piece of cardboard is needed Please help me solve the exercise in the picture Find the difference quotient for f(x) = x2 + 4. 11. What is the midpoint of CD?12. a. What are the exact lengths ofsegments AB and CD?b. How do the lengths of AB and CDcompare?c. Is the following statement true orfalse?AB=CD A school has 4 different after school activities planned in the fall Janet has time to participate in 2 of these activities. How many different pairs of after-school activities can Janet choose from the available activities? Amanufacturer of potato chips would like to know whether its bag filling machine works correctly at the 433 gram setting. It is believed that the machine is underfilling the bags. A 26 bag sample had a mean of 427 grams with a variance of 324. A level of significance of 0.05 will be used. Assume the population distribution is approximately normal. Is there sufficient evidence to support the claim that the bags are underfilled? A Triangular Park ABC has sides 120 m, 80m and 50m. a gardener has to put a fence all around it and also plant grass inside. How much area does she need to plant? Find the cost of fencing it with barbed wire at the rate of of Rs. 20 per metre leaving a space 3m wide for a gate on one side? 2 square5 + 5 square5 What is the area of a circle with a diameter of 20 inches if [tex]\pi[/tex]=3.1415 TUOI 7. A stone dropped from a window reaches the ground in 1.5 seconds. Calculate the height of the window above the ground ng cng sn l g? A student dissolves 12.6g of amonium nitrate(NH4NO3) in 250.g of water in a well-insulated open cup. She then observed the temperature of the water fall from 23.0C to 18C over the course of 6.1 minutes. NH4NO3 NH4+ (aq) + NO3^-(aq)a. Is this reaction exothermic, endothermic, or neither? b. If you said the reaction was exothermic or calculate the amount of heat that was released or absorbed by the reaction in this case. c. Calculate the reaction enthalpy Hrxn per mole of NH4NO3. Rachel bought 2.5 pounds of cookies for $13.40. Her friend buys 4.5 pounds of crackers for $24.75. Which is lessexpensive per pound? By how much? (HINT: Find the unit rate for each, then find the difference)