Suppose an Individual Is Heterozygous for Alternate Alleles of Gene

Multiple Choice

Suppose an individual is heterozygous for alternate alleles of gene A (Aa) .Under what conditions would a crossover in a somatic cell of this individual lead to a clone of cells that are homozygous for a? (Pick the most precise answer. )

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 end of the chromosome and involve two homologous (nonsister) chromatids.
C) The crossover would have to occur between the A locus and the end of the chromosome and involve two nonhomologous chromosomes.
D) The crossover would have to occur between the A locus and the centromere and involve two sister chromatids.