Given the end results of the two types of division, why is it nec...

Question

Given the end results of the two types of division, why is it necessary for homologs to pair during meiosis and not desirable for them to pair during mitosis?

Accepted Answer

Hello, everyone and welcome to today's video to which of the following genetic variation sources occurs during meiosis. Now, let's go over each of our answer choices from A 3D. So we can determine the correct one. Let's begin by answer choice D which is gene flow. Now, gene flow is not going really to be a molecular form of genetic variation. It refers more to the transfer of A or genes between populations. Now, this does not occur during meiosis. So we're going to cancel it out, then we have genetic mutations. Now, mutations occur in many aspects of our molecular makeup. However, these are not going to be specific to meiosis because of that, we're going to cancel them out. Then we have B which is M R N A splicing. This is a type of post transcription modification now because it is a type of post transcription modification. This is really again, not going to be involved with meiosis. So we're also going to cancel it out. And finally, we have a which is homologous recombination. Now, homologous recombination is a process of gene shuffling which is going to occur during the cross over period of meiosis Now, this is going to result in the gene in genetic material being shuffled from one of the and becoming one of the main sources of genetic variation from the parents to the offspring. This is how we get offspring with different forms of genetic variation because of this homologous recombination of the chromosomes. Now, this does occur during meiosis and therefore, we're going to highlight answer choice. A homologous recombination as a final answer to our question, I really hope this helped and I hope to see you on the next video.

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Given the end results of the two types of division, why is it necessary for homologs to pair during meiosis and not desirable for them to pair during mitosis?