If an individual is heterozygous at two loci (A b / a B) that are located on the same chromosome arm with A closer to the centromere than B, under what conditions would a crossover in a somatic cell generate a twin spot?

A) The crossover would have to occur between the A locus and the centromere and involve two homologous, nonsister chromatids.
B) The crossover would have to occur between the A locus and the B locus and involve two homologous, nonsister chromatids.
C) The crossover would have to occur between the B locus and the end of the chromosome and involve two homologous, nonsister chromatids.
D) A double crossover would have to occur, with one crossover between the A locus and the centromere and a second crossover between the A and B loci, and both crossovers would have to involve two homologous, nonsister chromatids.
E) No crossover in a somatic cell could generate a twin spot.


A) The crossover would have to occur between the A locus and the centromere and involve two homologous, nonsister chromatids.

Biology & Microbiology

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