Question

the a and b genes are on nonhomologous chromosomes. a zygote is formed by the fusion of a sperm with the genotype ab and an egg with the genotype ab. the zygote develops into a male. which of the following are genotypes of sperm that could be produced by this male?

ab, ab, ab and ab
ab and ab
ab and ab
only ab
only ab
a, b, a, and b

Explanation:

When a sperm with genotype \(aB\) and an egg with genotype \(Ab\) fuse, the zygote has the genotype \(AaBb\). According to Mendel's law of independent assortment, during meiosis (spermatogenesis in males), alleles on non - homologous chromosomes assort independently. For a genotype \(AaBb\), the possible sperm genotypes are \(AB\), \(ab\), \(Ab\), and \(aB\) (by different combinations of \(A/a\) and \(B/b\) alleles).

Answer:

AB, ab, Ab and aB