The accompanying chromosome diagram represents a eukaryo...

Question

The accompanying chromosome diagram represents a eukaryotic chromosome prepared with Giemsa stain. Indicate the heterochromatic and euchromatic regions of the chromosome, and label the chromosome's centromeric and telomeric regions.

Do you expect the centromeric region to contain heterochromatin? Why or why not? <>

Accepted Answer

Welcome back. Here's our next question. What function does A centromere play in genetics? And our answer choices are choice. A, it controls how genes are expressed. B it specifies an individual sex C, it contributes to genetic recombination or D and ensures the proper segregation of chromosomes during cell division. So let's recall that the centromere we have our chromosome is that central portion that joins the two sister chromatid together. And during cell division, we have those spindle fibers that attach to that chromosome and pull apart the cysto chromatid and pull them to the opposite sides of the cell or cell division. So when we think about that process that can guide us to our correct answer, which is d it ensures the proper segregation of chromosomes during cell division helps them separate properly to the two different daughter cells with half with one sister chromatid going to each daughter cell. This is obviously really, really crucial because chromosomes separating incorrectly can lead to smes, other aids that really have deleterious consequences. When we look at our other answer choices, um we can see choice a controls how genes are expressed is incorrect as the centromere is not involved in regulating gene expression. Choice B specifies an individual's sex. Well, that would be the sex chromosomes, not our centromere. And then finally, choice C contributes to genetic recombination. Well, that would be the arms of the chromosome that cross over each other and then swap parts in the process of recombination. But that doesn't involve our centromere. The cent mirror might get dragged along in various recombination events but is not a contributing factor. So choice C is not our answer. So again, what function does the centromere plan in genetics? Choice D and ensures the proper segregation of chromosomes during cell division? See you in the next video.

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