Classify the examples as prezygotic or postzygotic barriers. Prezygotic barrier Postzygotic barrier Answer Bank A horse and donkey mate to produce a sterile mule. One bird species prefers open areas, whereas another bird species prefers wooded areas. One frog species mates in the spring, whereas another frog species mates in the summer. Individuals from two different species mate, but the resulting embryo dies before birth.
Prezygotic and Postzygotic barriers are reproductive isolation mechanisms, which avoid mating events or prevent viable and fertile mixtures between different species. Pre-zygotic barriers: One bird species prefers open areas, whereas another bird species prefers wooded areas. One frog species mates in the spring, whereas another frog species mates in the summer. Postzygotic barrier: A horse and donkey mate to produce a sterile mule. Individuals from two different species mate, but the resulting embryo dies before birth.
What is reproductive isolation?This is a mechanism through which different species or populations do get to mate and produce fertile offspring. This mechanism allows the accumulation of genetic differences and favors speciation.
Different barriers inhibit or interrupt the genetic flow between species.
Reproductive barriers are isolation mechanisms that prevent mating between two or more species. There are two types of barriers,
prezygotic ⇒ that avoids fertilization between individuals of different species, postzygotic ⇒ that impedes the zygote from developing and reaching the adult stage.Pre-copulatory or pre-zygotic barriers include:
Ecological or by habitat isolation; Seasonal or temporal; Sexual o ethologic; Mechanic; Gametes incompatibility.Postzygotic mechanisms barriers include:
Hybrid inviability, Hybrid sterility, Hybrid reduced viability or fertility, Cytoplasmic interactions.Examples,
Pre-zygotic barriersOne bird species prefers open areas, whereas another bird species prefers wooded areas (Ecological or by habitat isolation)
One frog species mates in the spring, whereas another frog species mates in the summer (Seasonal or temporal isolation)
Postzygotic barrier
A horse and donkey mate to produce a sterile mule (Hybrid sterility).
Individuals from two different species mate, but the resulting embryo dies before birth (Hybrid inviability).
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Researchers performing __________ insert a weak electric current into the brain to stimulate it. a. lesioning b. esb c. eeg d. pet please select the best answer from the choices provided a b c d
Researchers performing ESB technique insert a weak electric current into the brain to stimulate it.
What does ESB contain in psychology?
Electrical stimulation of the mind (ESB) is a method which includes the creation of a susceptible electric modern into precise places withinside the mind via way of means of the use of more than one microelectrode to use brief pulses of electrical currents supposed to imitate the herbal glide of impulses via the neural pathways.
What contribution do ESBs make to our understanding of the brain?
Electrical brain stimulation (ESB) is useful in a variety of settings, including neurosurgery and experimental research. Neurosurgeons can use this procedure to help doctors determine which brain tissue needs to be removed.
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In an asexual life cycle, cells reproduce by meiosis. fertilization. All of the answer choices are correct. meiosis and fertilization. mitosis.
Answer:
k
Explanation:
lactic acid was generated by the leg muscles after a bunch of hard squats and is now circulating in the blood which of the following is likely to occur as a compensation of this lactic acid buildup
The following are likely to occur as a compensation of lactic acid buildup:
Decreased urinary pHIncreased H+ in bloodIncreased hyperventilationIncreased H+ selectionWhat is lactic acid?
Red blood cells and muscle cells are the principal producers of lactic acid. When oxygen levels are low, it develops when the body metabolizes carbohydrates for energy.
In the body, lactic acid serves three basic purposes:
as a significant source of energy for mitochondria as a starting point for the production of glucose as a signalling moleculeLearn more about lactic acid here:
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Answer and match them
Answer:
Answered (?)
Explanation:
1. C
2. E (?)
3. F
4. D
5. B
6. A
I wasn't sure about E because for me I would say that means 'extinction' but that's not an answer, I tried my best and hope this helps!
which bones unite to form the highlighted bone?
The highlighted bone is named the sternum. The sternum, which lies in the middle of the chest, is where the ribs connect to the body.
Which joint does the humerus's highlighted bone form?The humeral head's ball and glenoid's socket connect at the glenohumeral joint. The supraspinatus, infraspinatus, teres minor, and subscapularis muscles' tendons make up the rotator cuff, which joins the humerus to the scapula. Muscle and bone are joined via tendon.
What develops in the indicated curvature?When a child is able to sit up on their own, the lumbar curvature that is highlighted begins to develop. The structure in bold allows for head lateral rotation. The structure in bold allows for head lateral rotation.
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_____ provides employees with specific, identifiable knowledge and skills for use in their present jobs. a. Development b. Recruiting c. Networking d. Training
Answer:
D
Explanation:
in a study of the forces involved when motor proteins
Motor proteins also produce force locally within the network of cytoskeletal polymers, which transmits these forces to determine the shape of each cell and, ultimately, the architecture of tissues and whole organisms. Chapters 37 to 39 and 44 illustrate how motors move cells and their parts.
What would happen to a cell that didn’t replicate its dna before cell division?
The cell will not proceed with the further processes.
What is equational division?
Chromosome replication and equal distribution between the two daughter cells occur during the cell division process known as mitosis. Each daughter cell has the same number of chromosomes as the parent cell, making them diploid. Thus, mitosis is also referred to as equational division.
Unequal division will result if the cell didn't replicate prior to actually cell division. As a result of the checkpoints, it won't move on to the next step. The checkpoint will later start the apoptosis process, which results in programmed cell death.
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classify each mutation example as definitely positive, definitely negative, or most likely neutral. each category has two examples. you are currently in a sorting module. turn off browse mode or quick nav, tab to items, space or enter to pick up, tab to move, space or enter to drop. beneficial mutations neutral mutations harmful mutations answer bank
A beneficial mutation is one that has a good effect on an organism. These mutations are uncommon yet important. The benefit that a beneficial mutation provides the organism is passed down from generation to generation, increasing the chances of survival for the offspring.
Neutral mutations:
Neutral mutations are changes in DNA sequence that are neither beneficial nor harmful to an organism's ability to survive and reproduce. In population genetics, neutral mutations are mutations in which natural selection has no effect on the spread of the mutation in a species.
Harmful mutations: Mutations that are harmful can result in genetic diseases or cancer. A genetic condition is an illness that results from a mutation in one or more genes. Cystic fibrosis is a human example. A single gene mutation causes the body to produce thick, sticky mucus, which clogs the lungs and blocks ducts in digestive organs.
What is mutation?
A mutation is a change in an organism's DNA sequence. Mutations can occur as a result of errors in DNA replication during cell division, mutagen exposure, or viral infection.
What causes mutation?
Mutations can occur as a result of mistakes in DNA replication during cell division, mutagen exposure, or viral infection. Germline mutations (those that occur in eggs and sperm) can be handed on to offspring, but somatic mutations (those that originate in body cells) cannot.
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Full Question: Classify each mutation example as definitely positive, definitely negative, or most likely neutral. Each category has two examples.
electrons excited in photosystem ii help the chloroplast produce
As excited electrons move through the electron transport chain, NADPH is created.
The photosystem II's source of the excited electrons is what?A chlorophyll molecule's excited electron is moved to the an electron acceptor at the reaction center.It's an oxidation-reduction reaction right now.An electron from water is used in photosystem II to replace the electron lost from the reaction center.
What is produced during photosynthesis by photosystem 2?In oxygenic photosynthetic organisms, photosystem II is the first membrane protein complex.It uses light energy to catalyze the oxidation of water, which results in the production of atmospheric oxygen.
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structural damage from tornadoes is usually caused by
High winds are frequently to blame for tornado-related structural damage.
Why do tornadoes form?Thunderclouds contain warm, humid air that rises as chilly air that is accompanied by rain or hail descends.These circumstances might result in the formation of whirling air currents inside the cloud. Although the whirling currents begin horizontally, they have the ability to turn vertical, drop from the cloud, and eventually form a tornado..
What three types of tornadoes are there?Examples of various tornado types include the multiple vortex tornado, landspout, and waterspout.A waterspout is caused by a massive cumulus or cumulonimbus cloud coupled to a spiraling funnel-shaped.
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the theory of endosymbiosis and history of life on earth allows one to predict that the gene sequences that are responsible for encoding functional, mitochondrial ribosomes in a particular tree likely share many similar nucleotides in the sequences from the ribosomal genes of other plant species bacterial species other tree species
The theory of endosymbiosis and the history of life on earth allows one to predict that the gene sequences that are responsible for encoding functional, mitochondrial ribosomes in a particular tree likely share many similar nucleotides in the sequences from the ribosomal genes of other bacterial species (Option II).
What is the theory of endosymbiosis?The theory of endosymbiosis is a model to explain the origin of eukaryotic cells, which postulates that these types of organisms evolved as a consequence of symbiotic relationships between primitive bacterial cells that converted into mitochondria and chloroplasts in animals and plants.
Therefore, with this data, we can see that the theory of endosymbiosis is based on the scientific idea that eukaryotic cells as observed in plants and animals generated due to symbiosis with primitive bacterial cells that entered into the cell and performed cellular respiration and photosynthesis.
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Which of the following processes correctly describes alternative RNA spiling?
O It can allow the production of similar proteins from different RNAS.
O lt is a mechanism for increasing the rate of transation.
O It increases the rate of transcription.
O It can allow the production of protens of different sizes and functions strom a single mPRA
Answer: d
Explanation:
which of the following tactile receptors is found in the dermal papillae? identification of tactile receptors which of the following tactile receptors is found in the dermal papillae? identification of tactile receptors tactile disc ruffini corpuscle free nerve endings tactile corpuscle
Meissner corpuscle or tactile corpuscle is the tactile receptor found in the dermal papillae.
Professor Georg Meissner and Professor Rudolf Wagner initially identified Meissner corpuscles, often referred to as Wagner-Meissner corpuscles or tactile corpuscles, as a subset of mechanoreceptors in 1852. These unique encapsulated nerve terminals transmit low-frequency vibration and fine touch sensations to the central nervous system from the dermal papillae of glabrous skin (CNS). Meissner corpuscles are crucial for somatosensory acuity, particularly in the palmar skin and digital extremities. This has clinical implications for diabetic neuropathy, peripheral neuropathy, and the aging-related deterioration of dermatological tactile sense.
Meissner corpuscles are ellipsoid mechanoreceptors that are situated 150 micrometres superficially within the dermal papillae. The corpuscles have a long axis that is perpendicular to the skin's surface and are between 20 and 40 micrometres in diameter and 80 and 150 micrometres in length. Less than three corpuscles per papilla, with one corpuscle every two to four dermal papillae. The site of genesis affects the receptors' size and density.
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use the following model of a eukaryotic transcript to answer the question. e1-4 refer to the exons, and i1-3 refer to the introns in the pre-mrna transcript. 5' utr e1 i1 e2 i2 e3 i3 e4 utr 3' suppose that exposure to a chemical mutagen results in a change in the sequence that alters the 5' end of intron 1 (i1). which of the following results might occur? question 6 options: premature transcriptional termination loss of e1 loss of the gene product inclusion of i1 in the mrna
The exposure to a chemical mutagen results in a change in the sequence that alters the 5' end of intron 1
5' UTR E1 E2 E3 E4 UTR 3'
inclusion of I1 in the mRNA
Asymmetric RNA Splicing The first genes with alternative RNA splicing were discovered in the 1970s.
When multiple combinations of exons are joined to make the mRNA, a procedure called alternative RNA splicing enables diverse protein products to be synthesized from a single gene. The frequency of various splicing alternatives is controlled by the cell as a way to regulate the production of different protein products in different cells or at different stages of development.
Alternative splicing can be haphazard, but more often it is controlled and acts as a mechanism of gene regulation. In eukaryotes, alternative splicing is widely recognized as a frequent process of gene control. One estimate place the proportion of human genes that are expressed as numerous proteins by alternative splicing at 70%.
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