Question

Sex-linked crosses

4. Hemophilia is an X-linked disease, meaning that the gene that causes the disease is found on the X chromosome. Affected males only have to have one allele to have the disease (X^hY), while affected females have to have two alleles (X^hX^h). Imagine that an affected male has children with an unaffected carrier female.

a. What are the genotypes of the parents in this cross?

b. Draw a Punnett cross to show the offspring of this couple.

c. What are the expected genotypes and phenotypes of the children of this couple?

Codominance

5. Blood type is determined by the I gene, which encodes an enzyme that adds a specific glycoprotein to red blood cells. Individuals with the genotypes I^AI^A and I^Ai have Type A blood. An individual with the genotypes I^BI^B and I^Bi have Type B blood. Individuals with the genotype I^AI^B have Type AB blood while individuals with the genotype ii have Type O blood. What is the probability that a man with type AB blood and a woman with type A blood, whose mother is type O, would produce a child that is each of the following:

a. Type A

b. Type AB

c. Type O

d. Type B

Answer 1

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