For Problems 25–30, consider a diploid cell that contains three p...

Question

For Problems 25–30, 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. You may wish to use a large piece of brown manila wrapping paper or a cut-up paper grocery bag for this project and to work in partnership with another student. We recommend cooperative learning as an efficacious way to develop the skills you will need for solving the problems presented throughout this text.

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

Accepted Answer

Welcome back everyone. Here's our next problem. It says synopsis refers to the connection of Malaga's chromosomes to form a. And we've got answer choices of P arm. Tetrapod gamut or centrum ear. Well, connection maybe isn't the best word here? Maybe think of it as association because the homologous chromosomes aside from say crossing over with each other, they're not necessarily connecting with each other, but they're pairing up during pro phase one of my aosis. And imagine that we have these guys paired up in this phase of mitosis. Each chromosome is in the form of a dye add in to sister chroma tides that have been duplicated. So when we look at how many chroma tides we have um when are homologous pair is paired up. We have four chroma tides total in that pair of homologous chromosomes. So our answer choice here is choice be tetrapod that prefects tetra meaning four. So you're not just having uh you know, the a pairing of two single chroma tides. You're having a pairing of two double to die, add forms of the chromosomes. Let's look at our other answer choices here. Choice A is P arm. The p arm would be the shortest arm of chromosome measured from the central here. So that's not our answer choice choices. Gamut, well a gamut is not a connection of chromosomes. A gamut, is that germ cell with a happy Lloyd number of chromosomes. So that's obviously not our answer choice here and then finally choice the centrum ear and centrum here. Is that physical link between sister chroma tics where they're joined together. But that's obviously not our answer choice here, So Choice D. Will cross out. So again, synopsis refers to the connection of homologous chromosomes to form a Choice B. See you in the next video.

Key Concepts

Mitosis

Meiosis

Chromatid Pairing and Synapsis

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