In fruit flies, the gene for eye color is located on the X chromosome, and the red eye allele (R) is dominant
to the white eye allele (r). A carrier female is mated with a male fly with genotype X
rY. Which of the
following statements best describes the expected outcome of the cross?
a. The chance of an offspring having red eyes is 75%
b. The chance of an offspring having white eyes is 50%
c. The chance that a male offspring will have white eyes is 0%
d. The chance that a female offspring will have red eyes is 100%
Answer:
b. The chance of an offspring having white eyes is 50%
Explanation:
So the genotype of the male fly is X^r Y. This means the male has white eyes because he only has one X chromosome, so he will express whatever allele is on that chromosome.
The genotype of the female fly, though, is X^R X^r. This is because carriers are heterozygous for traits, and the sex chromosomes of most females is XX (with some exceptions, like XXX, or X (Turner syndrome)).
If we cross this, what are the outcomes? Do a Punnett square. You get the genotypes of X^r X^R, X^r X^r, X^R Y, and X^r Y. The expected phenotypes are a red eye female, white eye female, red eye male, and white eye male.
Now, let's look at the choices:
A.: The chance of an offspring having red eyes is not 75%; it is 50%.
B.: The chance of an offspring having white eyes is 50%!!!
C.: The chance that a male offspring will have white eyes is 50%, not 0%.
D.: The chance that a male offspring will have white eyes is 50%, not 100%.
Sooo, it's B!
The number of waves that pass through a fixed point per second is the (amplitude, frequency, wavelength)
of the wave. This value increases when the (amplitude, frequency, wavelength)
of the wave decreases
Answer:
Frequency / Wavelength
Answer:
frequency and wavelenght
Explanation:
Vestigial structures, such as hip bones in whales and appendixes
in humans, are those that have little or no function for the
organism. What is the most likely reason for this loss of function
over time?
The organism is undergoing speciation.
The organism is experiencing genetic drift.
The structure was over utilized by the organism.
The structure was not highly beneficial to the organism.
Answer:
A.
Explanation:
Humans used to use the appendix for good bacterial health in the gut. People used to drink dirty water and eat food that had lots of bacteria. The appendix would save them from infection.
Eric has made a terrarium, a closed container with plants in it, and he has put
enough water into it to satisfy the needs of the plants. Does Eric need to add
water to his terrarium again? Why or why not?
Answer:
Yes
Explanation:
The water will be used by the plants sooner or later so their basic metabolic needs can be achieved. Also, the plants will loose their water by transpiration, in order to produce their carbohydrates. Therefore the amount of water will not be enough and has to be replenished.
PLEASE HELP I WILL BE GIVING THE BRAINLIEST AND 15 POINTS!!!!!!!!
Charlotte placed raisins in a glass of water and after a while, saw them swell up and get larger. It made her wonder about the way water moved into different items. She knew cells allowed materials in, but she wanted to know more and she read that the cell membrane had specific jobs. Which of the following correctly describes the cell membrane’s function?
A. It is permeable, so it can allow all materials to move freely across the cell membrane.
B. It uses diffusion and osmosis to move all materials into and out of the cell.
C. It uses active transport and facilitated diffusion to move all materials into and out of the cell.
D. It is selectively permeable, so it can allow certain materials to pass through it and prevent others from passing into the cell.
Answer:
D. It is selectively permeable, so it can allow certain materials to pass through it and prevent others from passing into the cell.
Explanation:
Before mitosis begins, which happens before the nucleus starts dividing?
The DNA replicates.
The cytoplasm separates.
The sister chromatids separate.
The homologous chromosomes cross over.
Answer:
The DNA replicates.
Before mitosis begins, the DNA replicates. During the S phase of interphase, which precedes mitosis, the DNA in the nucleus undergoes replication, resulting in the formation of identical sister chromatids.
This ensures that each daughter cell produced during mitosis receives a complete set of genetic information.
After DNA replication, the cell enters the mitotic phase, during which the nucleus divides and the replicated DNA is distributed to the daughter cells.
The cytoplasm separates during cytokinesis, which occurs after mitosis and is not directly related to events before nucleus division. The separation of sister chromatids occurs during anaphase of mitosis, not before the nucleus starts dividing.
Thus, the process of homologous chromosomes crossing over occurs during meiosis, not mitosis.
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The different functions of the skeletal system include all of the following EXCEPT: *
a) Forms blood cells
b) Protects internal organs
c) Stores hormones
d) Assists movement
Which type(s) of muscle can contract without stimulation from the nervous system? *
a) skeletal only
b) skeletal and smooth
c) smooth and cardiac
d) cardiac only
Which of the following are events following fertilization? (Check all that apply. There may be more than one answer). *
a) Embryo develops into the fetus
b) Zygote cell rapidly divides
c) Embryo embeds into uterine wall
d) Zygote travels down the fallopian tube toward the uterus
Storing hormones, smooth and cardiac muscles are the correct answers.
Storing hormones is not function of skeleton system. Skeleton system protects internal organs such as heart, kidney and lungs etc. It is also responsible for the movement of the muscles as well as produces blood cells because of the presence of bone marrow.
Smooth and cardiac muscles can contract without nervous system stimulation because they are involuntary Muscle which is beyond the control of the nervous system so we can conclude that storing hormones, smooth and cardiac muscles are the correct answers.
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What are the different sensory structures and what are each of them able to
detect?
Answer;
Chemoreceptor,Thermoreceptors,Mechanoreceptors,Photoreceptors
Explanation:
Chemoreceptors detect the presence of chemicals
Thermoreceptors detect changes in temperature
Mechanoreceptors detect mechanical forces.
Photoreceptors detect light during vision.
What are two main sources of genetic material found in viruses?
Answer:
Most have RNA or DNA as their genetic material, but they also consist of a virion, which has nucleic acid and a shell of protein.
Explanation:
What percent of the offspring will be red, if we cross two pink tulips?
75 %
50 %
25 %
Answer: 50
Explanation:you are combining two pink to the possibility of the tulips being red will be 50 50
It is a case of incomplete dominance. 25% of the offspring will be red. Therefore, option C is correct.
What is incomplete dominance?When two heterozygous alleles in a gene interact with each other, their traits are expressed partially, because they both are not dominant on each other. This type of dominance is called incomplete dominance.
It is not necessary to do a test to identify the heterozygous in incomplete dominance. The phenotype and genotype ratio is the same in this dominance. Incomplete dominance is different from co-dominance.
When two heterozygous pink tulips (Rr) cross, then 25% red (RR), 50% pink (Rr), and 25% white (rr) tulip flowers are produced. The phenotype and genotype ratio will be 1:2:1. Therefore, option C is correct.
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Which of the following facts are NOT true about dichotomous keys?
Answer:
Explanation:
B C
Do roots, leaves, or stems do more in photosynthesis in plants?
Answer:
Leaves
Explanation:
Leaves help are flat and thin which makes it easy for them to take in more light, which makes them play the biggest rold in photosynthesis.
Who help me about this?
Answer:
Its easy Ana
Explanation:
Examine the picture of an onion root tip with cells in various stages of the cell cycle. A student claims that interphase is the longest stage of the cell cycle. Another student claims that mitosis is the longest stage. Using evidence from the photo, determine which student is correct and why. A) Mitosis is the longest stage because anaphase requires more time to separate chromatids. B) Interphase is the longest stage because chromosomes are visible in the majority of the cells. C) Mitosis is the longest stage because the majority of the cells in the photo are replicating their DNA. D) Interphase is the longest stage because the majority of the cells in the photo have uncondensed chromatin and are not dividing.
Answer:
B
Explanation:
the longest phase in the cell division is interphase because the DNA replication occurs in this phase
As per the image interphase is the longest stage because the majority of the cells in the photo have uncondensed chromatin and are not dividing. The correct option is D.
What is cell cycle?The cell cycle, also known as the cell-division cycle, is the sequence of events that occurs in a cell that causes it to divide into two daughter cells.
A cell cycle is the series of events that takes place in a cell as it grows as well as divides.
A cell spends the majority of its time in what is known as interphase, where it grows, replicates its chromosomes, and prepares for cell division. The cell then exits interphase, goes through mitosis, and divides completely.
Interphase is the longest stage, according to the image, since the maximum of the cells in the photo have uncondensed chromatin as well as are not dividing.
Thus, the correct option is D.
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Your question seems incomplete, the missing image is attached below:
The changes in composition in an area over time is called
Answer:
Ecological Succession.
Explanation:
What is the second most abundant element in the human body?
Select one:
A. carbon
B. methane
C. water
D. oxygen
water
Explanation:
cuz after blood , water is the next thing that follows
Answer:carbon
Explanation: water is the first abundant element in the human body and carbon is the second
Which chromosome is involved in Prader Willi and Angelman Syndrome?
A) Chromosome # 46
B) Chromosome # 1
C) Chromosome # 15
D) Chromosome #23
Answer:
C.
Explanation:
Answer:
Chromosome 15
Explanation:
Vaccine: What is one advantage of being vaccinated against a particular virus?
I
Answer:
the vaccinated person's immune system will likely become immune to said virus and it will cause the body vaccinated to develop antibodies
Explanation:
i hope this helps a little bit :))
Antibodies make the cells aware a certain virus is entering the body and detects and fights it off. Which leads you to a fever because that means they're currently working hard to eliminate the virus.
Can someone please help me with these two questions I will mark you as the best answer
True or False: Too much carbon in seawater prevents clams, snails, and other
sea animals from growing their shells.
Answer: False................
Answer:
False
Explanation:
Carbon is one of the most abundant resources for sea animals, and they actually need a lot of carbon to grow their shells.
How does light behave around opaque, transparent and translucent
Need answer ASAP please
NO copy and paste thanks!
Answer:
Transparent objects allow all the light to pass through them. Opaque ones allow no light to pass through. Translucent allows light to go through but the area in it is no visible to determine the object
Explanation:
Think of Transparent as a window u can see straight through it is clear.Think of Translucent as a window with cold fog on the window light can come through it but you can't see whats outside.Think of Opaque as a black chalkboard light reflect on it but light cannot go through it
Information related to the organisms found on Earth during
various geological time periods is represented in the accompanying
chart.
OOEEOC 0-0 C-E
2525
-Edw-
4.6 (?) Billion
600 Million
200 Million
60 Million
Years Ago
Years Ago
Years Ago Years Ago
Precambrian
Paleozoic
Mesozoic Cenozoic
(Simple
(Age of Amphibians, Fishes, (Age of Reptiles) (Age of
Multicellular
and Invertebrates)
Mammals)
a organisms and
First Protists)
Past
Present
Geologic Time
Which statement concerning the first appearance of the organisms
over the time period represented in this chart is most likely
correct?
Answer:
D
Explanation:
How is the AB blood group an example of codominant inheritance
Answer:
Explanation:
AB blood type is codominant because the red blood cells have the products of both the A and the B alleles of the ABO gene.
Hope that helped!
What is a drug?
What is the difference between medicines and recreational drugs ?
Give two examples of legal recreational drugs?
Give two example of illegal (against the law) drugs?
What is a depressant?
Give two effects that a depressant drug has on the body.
Give two long term effect of taking a depressant drug.
What is a stimulant?
Give one example of a legal stimulant and one example of an illegal stimulant.
What are the effects of taking a stimulant?
Answer:
recreational - enjoyment i.e. weed, alcohol (legal)
shrooms, lsd (illegal)
liver or lung failure
stimulant- helps asthma and other things example. dexedrine
the effects of taking stimulants is loss of appetite, increased heart rate, elevated blood pressure and body temperature, interrupted sleep patterns, panic, hallucinations, and irritability.
also a drug is a medicine or other substance which has a physiological effect when ingested or otherwise introduced into the body.
So i forgot what the genetic code is and how its read can somebody please be kind and help me..
Answer:
i d
Explanation:
Replicating the texture of shark skin to inhibit the ability of bacteria to attach to medical surface is an example of what application of biotechnology
A.Biochemical engineering
B. Biomimicry
C. Bioprospecting
D. Environmental biotechnology
Answer:
Biomimicry
Explanation:
How many alleles for one trait are normally found in the genotype for an organism
Answer:
2
Explanation:
1. Discuss how natural selection affects animal behavior and how behaviors can affect the survival of an animal species
Answer:
Animal behavior includes all the ways animals interact with other organisms and the physical environment. ... Behavior is shaped by natural selection. Many behaviors directly increase an organism's fitness, that is, they help it survive and reproduce.
During photosynthesis,light energy is converted to chemical energy
Answer:
True
Explanation:
Because during photosynthesis carbon dioxide is formed which is a chemical
Answer:
True
Explanation:
Photosynthesis is the process in which light energy is converted to chemical energy in the form of sugars. In a process driven by light energy, glucose molecules (or other sugars) are constructed from water and carbon dioxide, and oxygen is released as a byproduct.
The difference between the highest and lowest elevations on a map is the
a.geologic unit
b.topography
c.contour line
d.relief
please
Answer:
contour line
Explanation:
Answer:
d, relief
Explanation:
