3) if a normal sighted male has children with a carrier woman a) what proportion of their daughters will have normal colour vision? b) what proportion of their sons will be colour blind?

5. Sickle cell disease is inherited in an autosomal recessive manner. If Josh and Katie each have a sibling with sickle cell disease, but neither Josh nor Katie nor any of their parents have the disease, then what is the chance that a child of Josh and Katie's will have sickle cell disease? (Hint: First determine the chance that Josh and Katie are carriers of the disease.)

8.     Huntington’s disease is a degenerative disease of the nervous system that strikes in middle age. The allele that causes the disease (H) is dominant to the allele that results in the normal condition (h). Answer the following questions about the inheritance of this disease. A.     What is the genotype of a man who is normal but whose father had Huntington’s disease?   B.     What is the genotype of a woman who has Huntington’s disease if both of her parents had Huntington’s disease?   C.     If a man who is heterozygous for Huntington’s disease marries a woman who is normal, what would you expect for the genotypes and phenotypes of their children? D.     If a normal man marries a woman who is homozygous for Huntington’s disease, what do you expect for the genotypes and phenotypes of their children?

5. Which of the following couples could have a boy with Duchenne muscular dystrophy (DMD)?  a. a male with Duchenne muscular dystrophy and a homozygous dominant female b. a male without Duchenne muscular dystrophy and a homozygous dominant female c. a male without Duchenne muscular dystrophy and a carrier female d. a and c e. none of the above

23. What is the probability that the progeny of a cross between two individuals that are AABBCCDD will have the same genotype as the parents? A) 1/256 B) 1/16 C) 1/4 D) 1 24. Which of the following inheritance patterns describes the ability of a single allele to have multiple phenotypic effects? A) incomplete dominance B) multiple alleles C) pleiotropy D) epistasis 25. Phenylketonuria (PKU) is an inherited disease caused by a recessive autosomal allele. If two individuals are both carriers, what is the probability that their first child will be a carrier for PKU? A) 1/4 В) 1/2 С) 3/16 D) 3/8

4. Mr. Salazar has Type A blood while Mrs. Salazar has Type B. They have four children. Bobbie has Type A, Gabbie has Type B, Alex has Type AB, and Teddie has Type O. What are the genotypes of all six people in this family? NOTE: The ABO blood type gene has three alleles. IA and IB are codominant; i (for Type O) is recessive to both.

1. What percentage of the offspring will have a homozygous recessive genotype? Gray fur White fur 2. What will be the ratio of gray fur to white fur in the offspring? Gg x gg 3. What percentage of the offspring will have a tall phenotype? t. Tall Short 4. What percentage of the offspring will have a homozygous recessive genotype? TT tt 5. What percentage of the offspring will have white eyes? White eyes Dark eyes 6. What percentage of the offspring will have a heterozygous genotype? 7. What percentage of the offspring will

What is the chance that a child of III-1 and III-4 will have the disease?