Consider a diploid cell that contains three pairs of chromosom...

Question

Consider a diploid cell that contains three pairs of chromosomes designated AA, BB, and CC. Each pair contains a maternal and a paternal member (e.g., A^m and A^p). Using these designations, demonstrate your understanding of mitosis and meiosis by drawing chromatid combinations as requested. Be sure to indicate when chromatids are paired as a result of replication and/or synapsis.

Draw all possible combinations of chromatids during the early phases of anaphase in meiosis II.

Assume that during meiosis I none of the C chromosomes disjoin at metaphase, but they separate into dyads (instead of monads) during meiosis II. How would this change the alignments that you constructed during the anaphase stages in meiosis I and II? Draw them.

Accepted Answer

Hi everyone. Let's look at our next question. It says which of the following happens during the ana phase stage? Well, I'd like to remember that by thinking of how anna phase begins the letter A. So that makes me think of the word away. And in that ana phase stage, our chromosomes that have been lined up in the middle of the cell are pulled away from each other to the opposite poles of the cell. So with that kind of picture in mind, let's evaluate our answer choices. Choice A says the mon ads separate from each other. Now we've got in some of our answer choices the words mon ads and die ads. So just so we recall what those are. So we know to we answer this. Mon ads are the un duplicated form of a chromosome. So just a single chrome it'd whereas di ads. And again, you can see that di and mono prefix are the duplicated form have a chromosome Consisting of two sister chroma tits. So the dads are these guys here. So just a little reminder of that as we look at our answer choices. So choice A. The Menad separate from each other. Um, Well, this is not what's happening here because we in mitosis. We're talking about dads were talking about the sister comment. It's being separated from each other twice. B says the diocese break into two chromosomes and that is true. That has to happen for the sister chromosomes to be pulled to the opposite sides of the cell. So previously before in phase you had met a phase where the chromosomes lined up in the middle. Now in anna phase, the the two sister chroma tides are broken apart at the central here and then pulled away from each other to the opposite poles of the cell. Let's look at choice C. Choi C. Says the dye ads aligned in the equatorial plate. Well, this is not our answer here. Um When they align up, that would be part of meta phase. And I like to remember that because I think of meta phase. That m makes me think of middle. So I think of them lined up in the middle of the cell. And then finally Choice D the spindle fibers condense. Um That's not our answer. The spindle fibers form towards the end of pro phase. So in an A phase the spindle fibers are pulling the sister chroma tides apart to the opposite sides of the cells by shortening. So again, which of the following happens during the interface stage. Choice be the diets break into two chromosomes. See you in the next video

Key Concepts

Mitosis

Meiosis

Chromatid Pairing and Separation

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