Genes A and B are on the same chromosome.The genes have alleles A and B on one homologous chromosome,and the alleles a and b on its paired homolog.How could an individual with this allele arrangement produce a gamete with a chromosome containing the alleles Ab or aB?

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Quizplus · Accepted Answer

The only way for an individual to produce a gamete with the alleles Ab or aB is through crossing over. Crossing over occurs during meiosis when homologous chromosomes exchange segments of genetic material. If a crossover occurs between genes A and B, it can result in a gamete with an Ab or aB allele combination on its chromosome. Random fertilization (B) and independent assortment (C) occur during meiosis but do not specifically lead to a gamete with the desired allele arrangement. Mitosis (D) is not involved in sexual reproduction and fragmentation of the chromosome (E) would result in an abnormal gamete.

Genes a and B Are on the Same Chromosome