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.

How many different metaphase I chromosome alignments are possible in this male? How many genetically different gametes can this male produce? Explain your reasoning for each answer.

Accepted Answer

Hi everyone. Let's take a look at our next problem. Mitosis is a process of cell division that occurs in new chaotic cells and is essential for growth repair and reproduction. The four phases of mitosis are prophase meta phase anaphase and tele phase. During meta phase. The replicated chromosomes become aligned at the equatorial plane of the cell. Also known as choice, a meta phase plate, choice B cell plate, choice C frag plast or choice D all of the above. So let's keep in mind we do have the possibility of more than one correct answer. Well, the very name helps guide us to our correct answer here, which is choice, a meta face plate. That is the equatorial plane of the cell where those replicated chromosomes will line up choices B and C cell plate and frag plast also are part of the central area, the midplate of the cell, but they are not where chromosomes line up at meta phase. Um The cell plate in plant cells, this is a structure that forms during cytokinesis which is during tele not metaphyseal and is the precursor to the cell wall that will form there once you have the daughter cells. So that's not our correct answer. Choice as that's not that equatorial plane of the cell. And then the frag blast also in plant cells is made up of microtubules and other proteins and is a structure that directs the formation of the cell plate again during tele phase during that cytokinesis of plant cells. So choice c not correct and then obviously choice d all of the above is not our answer. So again, that equatorial plane of the cell where the chromosomes line up in meta phase is also known as choice a the meta phase plate. See you in the next video.

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