If an Individual Is Heterozygous at Two Loci (Ab/aB) Which

question 47

Multiple Choice

If an individual is heterozygous at two loci (Ab/aB) which are on the same chromosome arm with the A locus closest the centromere 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 locus and involve two homologous (non-sister) chromatids.
• B)The crossover would have to occur between the A locus and the B locus and involve two homologous (non-sister) chromatids.
• C)The crossover would have to occur between the B locus and the end of the chromosome locus and involve two homologous (non-sister) 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 locus and both crossovers would have to involve two homologous (non-sister) chromatids.
• E)No crossover in a somatic cell could generate a twin spot.

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