Epistasis is seen in people with red hair. These individuals are homozygous for the red hair alleles, masking the expression at the brown/blonde hair loci, resulting in red hair. At least two genes are involved in hair color. One hair color phenotype (brown vs. blond) has a dominant brown allele and a recessive blond allele. A person with a brown allele will have brown hair; a person with no brown alleles will be blond. The other gene pair has a non-red vs. red set of alleles, where the non-red allele is dominant and the allele for red hair is recessive. A person with two copies of the red-haired allele will have red hair, but it will be either auburn or bright reddish orange depending on whether the first gene pair gives brown or blond hair, respectively.
Consider a cross between two parents; The male is heterozygous for all allele pairs including blood type. The mother's hair is bright reddish-orange and is heterozygous for her blood type. The father is blood type B and the mother is blood type A.
A. Show the completed Punnett square for this cross.
B. How many genotypes are possible for the results of this mating?
C. How many phenotypes are possible in their offspring?
D. What percent of offsprings will have red hair and will be type AB?
E. What is the probability of getting an offspring whose phenotypic expression is exactly like that of the Mother?
F. What is the chance of getting an offspring whose phenotypic expression is exactly like that of the Father?
G. What is the probability of haveing children with a heterozygous blood type?
H. What is the chance of an offspring having brown hair and type O blood type?
I. What is the probability of getting an offspring with auburn hair and has blood type B?
J. What is the chance of getting an offspring with blond hair and is blood type A?