Reference no: EM132520278

1. A man and a woman both do not have sickle cell anemia. They have four children, as follows:

? a daughter who is normal and marries a man who is normal. They have a son with sickle cell anemia and two normal daughter

? a son who is normal and marries a woman who is normal. They have one son who is also normal.

? A daughter who has sickle cell anemia marries a normal man. They have two daughters, one who is normal and one who has sickle cell anemia, and a son who is normal

? A son who has sickle cell anemia and has no children and is not married.

a. Draw the pedigree for this family, indicating the affected people and the carriers.

b. Is sickle cell anemia an autosomal or sex-linked disorder? How do you know?

c. Is sickle cell anemia a dominant or recessive disorder? How do you know?

2.Red-green colour blindness is inherited as a sex-linked recessive trait. A colour-blind man and his wife with normal colour vision have a child. The woman gives birth to a daughter who has red-green colour blindness. The man claims that he could not have fathered this daughter. Before he goes on to Maury Povich to dispute his claim, could you use genetics to find out who is the father? Explain your answer using a Punnett square

3. In snapdragons, blue flowers are incompletely dominant over red flowers and the intermediate trait appears as purple. Use Punnett squares to answer the following questions.

a. A blue flowered plant is crossed with a purple flowered plant. What are the phenotypes of the offspring?

b. What would be the genotypic and phenotypic ratios be if two purple flowered plants are crossed?