Consider a Pair of Homologous Chromosomes Heterozygous for Three Genes

Multiple Choice

Consider a pair of homologous chromosomes heterozygous for three genes (e.g.ABC/abc) during prophase I of meiosis.Let the sister chromatids of one homolog be numbered 1 and 2;and the sister chromatids of the other homolog be numbered 3 and 4.A crossover that would result in genetic recombination (e.g. ,Abc or aBC) could involve which chromatids?

A) 1 & 2 or 3 & 4
B) 1 & 3 or 2 & 4
C) 1 & 4 or 2 & 3
D) 1 & 3 or 1 & 4 or 2 & 3 or 2 & 4
E) any two of the four chromatids