In an animal bearing the heterozygous inversion ABCDE[*]FGHI / ABGF[*]EDCHI,in one meiocyte a crossover occurred between the D and E loci and another crossover occurred between the F and G loci.The two crossovers involved all four chromatids.What will be the proportion of abnormal meiotic products from that meiosis? (Note: [*] = centromere.)
A)0%
B)25%
C)50%
D)100%
E)It depends on the distance between D and E and between F and G.

Question

Quizplus · Accepted Answer

In this scenario, crossovers occurring between D and E and between F and G in all four chromatids, combined with the presence of a heterozygous inversion, will result in all meiotic products being abnormal. This is because the crossovers within the inversion loop disrupt the normal alignment and segregation of chromosomes, leading to duplications and deletions in the resulting gametes.

In an Animal Bearing the Heterozygous Inversion ABCDE[*]FGHI / ABGF[*]EDCHI,in

In an Animal Bearing the Heterozygous Inversion ABCDE[]FGHI / ABGF[]EDCHI,in