1. In humans, widow’s peak (W) is dominant over having a straight hairline (w). If a homozygous man with a widow’s peak has a child with a woman with a straight hairline, what are the odds the child will have a widow’s peak? Show work.

1. In humans, widow’s peak (W) is dominant over having a straight hairline (w). If a homozygous man with a widow’s peak has a child with a woman with a straight hairline, what are the odds the child will have a widow’s peak? Show work.

2. Ellis-van Creveld syndrome is a recessive inherited condition that results in 6-fingered dwarfism. Two parents without this condition have with Ellis-van Creveld syndrome. What are the genotypes of the parents and offspring? What are the odds that the son will have a 6-fingered child if his partner is a woman who is heterozygous for the condition? Show work.

3. The gene for dangling earlobes is dominant over the gene for attached earlobes. A woman with attached earlobes has a child with a man with dangling earlobes whose mother had attached earlobes. What is the probability that this child will have attached lobes? Show work.

4. In humans, normal pigmentation is due to a dominant gene, while albinism is recessive. A normally pigmented man has a child with a woman with albinism. Their first child has albinism. What is the genotype of the father? Explain your answer.

5. Curly hair is a trait that displays incomplete dominance, with homozygous people (H_sH_s) having straight hair, homozygous people (H_cH_c) having curly hair, and heterozygous people (H_sH_c) having wavy hair. For two wavy-haired parents, what would be the predicted genotypic and phenotypic ratios of their offspring? Include a Punnett square.

6. A man with type A blood has four children a woman with type B. One child has type A blood, one has type B, one has type AB, and on has type O. What are the genotypes of the parents with regard to blood type? Show work.

7. Colorblindness is a sex-linked trait in humans. If a color-blind man marries a normal vision woman whose father was color blind, what are the odds that their son will be color-blind? What are the odds that their daughter will be color-blind? Show work.

8. Lactose intolerance is a recessive trait in humans. If a child is lactose intolerant, his parents are both able to digest lactose, but his maternal grandmother is lactose intolerant, does this mean the child inherited this trait from his grandmother? Explain.

9. dihybrid cross. In humans, the gene for the ability to taste phenylthiocarbamide (PTC) is dominant over the inability to taste PTC. The allele for brown eyes is dominant over the allele for blue eyes.  What are the odds that a man who is a blue-eyed taster and a woman who is a brown eyed non-taster will have a child who is a blue-eyed non-taster? Assume that both parents are heterozygous for their dominant trait. Show work.