Drosophila has a diploid chromosome number of 2n = 8, wh...

Question

Drosophila has a diploid chromosome number of 2n = 8, which includes one pair of sex chromosomes (XX in females and XY in males) and three pairs of autosomes. Consider a Drosophila male that has a copy of the A₁ allele on its X chromosome (the Y chromosome is the homolog) and is heterozygous for alleles B₁ and B₂, C₁ and C₂, and D₁ and D₂ of genes that are each on a different autosomal pair. In the diagrams requested below, indicate the alleles carried on each chromosome and sister chromatid. Assume that no crossover occurs between homologous chromosomes.

Diagram any correct alignment of chromosomes at mitotic metaphase.

Accepted Answer

Hi, everyone. Welcome back. Let's look at our next question. Meta phase is a stage in mitosis. The process by which a eukaryotic cell divides its nucleus and chromosomes in preparation for cell division, which of the following takes place during meta phase of mitosis, we have choice a pairing of homologous chromosomes. Choice B separation of Cytra chromatis, choice C condensation of chromosomes and choice D alignment of chromosomes at the equator of the cell. Well, I like to remember this by looking at meta phase and the fact that it begins with M and that makes me think of the word middle and indeed in meta phase, the chromosomes line up in the middle of the cell. And that leads us to choice d alignment of chromosomes at the equator of the cell. Let's look through our other answer choices just to see why they're not correct a pairing of the homologous chromosomes. Well, one way to remember this as I look at the letter P in pairing and that occurs during pro phase, but we're looking for what happens in meta phase. So that's not correct. Choice B is separation of sister chromatid. Uh When I think of separation. I think of the chromatid moving away from each other. And that makes me think of anna phase when that takes place. But again, we're looking for meta. So not our answer choice C is condensation of chromosomes. Well, this is at the very, very beginning of this whole process, the chromosomes have to condense to be able to pair up, be separated. And so this is in pro phase right at the beginning. So not our answer choice. So again, which of the following takes place during meta phase of mitosis choice d alignment of chromosomes at the equator of the cell. See you in the next video.

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