A 2 3 4 B a

During anaphase, the chromatids of one of the chromosomes do not separate; they both move to one side of the cell. The two chromatids of the other chromosome do separate normally. Although you could draw the nondisjoined chromosome moving in either direction (left or right), you draw it moving toward the left. This will make your answers to the questions below consistent with the grading key. Your anaphase drawing should show a cell that has two chromosomes on the left side of the cell. One of these chromosomes should have two chromatids and the other should have only one chromatid. The right side of the cell should contain a single chromosome with one chromatid. During telophase, the chromosome that failed to disjoin earlier has split. It is now two separate chromosomes. There should be three chromosomes on one side of the cell and one chromosome on the other side. All chromosomes should have one chromatid. Complete the drawings of telophase 5) Total number of chromosomes in cell A…

A male Drosophila melanogaster has the genotype A/a; B/b; C/c; XD/Y (all genes are on separate chromosomes). How many different sperm genotypes can it produce through meiosis of one single pre-gametic (2n) cell? (remember, there is no crossing over in male Drosophila) Explain.

Assume that the Holliday junctions resolve so that there is no crossing over (that is, there is no recombination). For the maternal chromosome list all of the possible base identities at the three positions after the cell repairs any mismatches. Do the same for the paternal chromosome.”