10. Suppose that you are investigating a dominant phenotype for stripes (sometim
ID: 190159 • Letter: 1
Question
10. Suppose that you are investigating a dominant phenotype for stripes (sometimes called bars) controlled by the B allele. For each of the crosses outlined below, state the phenotype of the male and female progeny.
a. The locus is Z-linked in an animal with a ZZ-ZW mechanism of sex-determination. A striped female is crossed with a non-striped male.
b. The locus is incompletely sex-linked in an animal with a ZZ-ZW mechanism of sex- determination. A striped female, whose father was non-striped, is crossed with a non- striped male.
Note: Unlike complete sex linkage, where the genes involved have loci on only one sex chromosome, with partial or incomplete sex linkage the genes concerned have loci on both sex chromosomes and thus are located in pairing segments of the two chromosomes.
Explanation / Answer
1. The females will be non-striped (Zs W) and male will be striped (ZS Zs).
2. The females will be striped (Zs WS) and male will be non-striped (Zs Zs).
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