Question

Show your work for all problems. 1) A diploid species of hamsters has a total of 4 chromosomes (2n = 4). A gene for whisker length is encoded by an autosomal gene and the long whisker allele (H) is dominant to the short whisker allele (h). A second gene located on the X chromosome is responsible for nose color. The brown nose allele (B) is dominant to the pink nose allele (b). A. (8 pts) A male with short whiskers and pink nose was crossed to a female with long whiskers and a brown nose. Half of the progeny had pink noses and half of the progeny had brown noses. All of the progeny had long whiskers. What are the genotypes of the male and female parents, brown nosed males, and pink nosed females? Genotype Male parent Female parent Brown nosed F1 males Pink nosed F1 females B. (8 pts) A brown nosed F1 male was crossed to a pink nosed F1 female. What are the expected phenotypic ratios of the F2 progeny? Give all phenotypes (including male or female) and the expected fraction (or percent) of each Expected fraction Phenotype