2) The gene for hair texture exhibits incomplete dominance. H is the allele for curly hair and h is the allele for straight hair. The heterozygous condition for this gene produces wavy hair. If a wavy-haired man and a straight-haired woman decided to have children, what would be the expected genotypic and phenotypic ratios of the children? 3) In Drosophila (fruit flies), a gray body color is dominant to black, and a pink eye color is dominant to red. If two flies are crossed that are each heterozygous for both traits, what would be the expected genotypic and phenotypic ratios of the offspring?

4) Two white mice were mated and over several years produced 13 black and 38 white offspring. Assume that the color gene is located on an autosomal chromosome, not a sex-determining chromosome (i. e. this is not a sex-linked trait).

What are the genotypes of the parents?

b) What is the expected genotypic ratio of their offspring?

5) In horses, black (B) is dominant over the allele for chestnut color (b). A chestnut mare is mated to a black stud. The first colt born is chestnut.

a) What are the genotypes of the three horses involved (mare, stud, colt)?

b) What percentage of their offspring will be expected to be black? What percentage
would we expect to be chestnut?

6) Hemophilia A is sex-linked recessive disease.

a) Two normal parents have their first son, who is found to be a hemophiliac. What are the genotypes of the parents, and the expected genotypic and phenotypic ratios of their future children? (Remember, this is a sex-linked disorder)

b) It is said that sex-linked diseases are often passed from a mother to her son. Explain
this statement.