1. A rare dominant allele causes mice to have a bent tail and has a penetrance value of 60%. A homozygous unaffected mouse is bred to a heterozygous mouse with a bent tail. What is the probability that an offspring will have a bent tail?
2. In rabbits, a series of multiple alleles controls coat color in the following way: C is dominant to all other alleles and causes full color. The chinchilla phenotype is due to the cch allele, which is dominant to all alleles other than C. The ch allele, dominant only to ca (albino), results in the Himalayan coat color. Thus, the order of dominance is C > cch > ch > ca. A heterozygous full-color rabbit (Cca) is crossed with a heterozygous chinchilla rabbit (cch ca). What are expected phenotypes and genotypes of the offspring?
3. Pattern baldness is an example of a dominant, sex-influenced trait. If a homozygous bald man has children with a woman who is heterozygous for baldness, what are the expected genotypes and phenotypes of their children?
4. In horses, the dominant allele G produces a gray horse and epistatically suppresses expression of any color alleles. At one locus, black (B) is dominant to red (b). If two dihybrid horses (GgBb) were crossed, what would be the possible phenotypes and the probability of each occurring?
In horses, the dominant allele G produces a gray horse and epistatically suppresses expression of any color alleles.At one locus, black (B) is dominant to red (b). If two dihybrid horses (GgBb) were crossed, what would be the possible phenotypes and the probability of each occurring?
