The diagram shows a cell in meiosis. Label the appropriate structures with these terms: chromosome (label as duplicated or unduplicated), centromere, kinetochore, sister chromatids, nonsister chromatids, homologous pair (use a bracket when labeling), homolog (label each one), chiasma, sister chromatid cohesion, and gene loci, labeling the alleles of the F and H genes.

Question

The diagram shows a cell in meiosis. Label the appropriate structures with these terms: chromosome (label as duplicated or unduplicated), centromere, kinetochore, sister chromatids, nonsister chromatids, homologous pair (use a bracket when labeling), homolog (label each one), chiasma, sister chromatid cohesion, and gene loci, labeling the alleles of the F and H genes.

Accepted Answer

Hi everyone. Let's look at this problem. During the pro phase stage of me. Ah Tick cell division. The chromosomes condenses and the nuclear envelope breaks down during this stage. The crossing over of homologous chromosomes happens, identify which of the following images illustrates the Kia's Mata where the exchange of genetic materials occurs. Well, if we were on a test and we're looking at this and we're thinking I do not remember what key is. Mata means. Uh we're given kind of a clue right here in the problem, it says where the exchange of genetic materials occurs. And if we're talking about crossing over, that is where the the point at which the chromosomes are able to exchange genetic materials, they cross over and then swap those pieces. So let's look we have four diagrams with different parts circled to give us possibilities for that point that Kia's Mata where the chromosomes exchange genetic materials. So let's look at Choice A Choice A shows these two inner arms of the homologous pair. And we have circled right here where the two arms have crossed over each other and these parts will switch and exchange genetic material between the pairs. So right away Choice A gives us a correct diagram of that point. So we're going to go ahead and highlight that. But let's just look through the other choices to understand why they are not correct. So Choice B. What's circled here is the centrum ears of the two chromosomes. So they may be trying to confuse us for the fact it's another word that begins with C. But there's no genetic information being exchanged at those centrum ears. That is not where crossing over occurs. So answer B is not correct. Choice C. Has circled these portions of the upper arms of the homologous pair. They're lined up next to each other, but they have not crossed over. They will not exchange genetic material, so Choice C. Is incorrect, and finally, Choice D. Does correctly include the crossing over point. However, it also includes the outer arms here and these outer arms don't cross over and don't exchange genetic material, so Choice D. Is also incorrect. Were confirmed that the correct illustration of the scales. Mata is in diagram A. See you in the next video.

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Key Concepts

Meiosis

Chromosome Structure

Genetic Recombination