Question

C 5. Compared to X-linked dominant diseases, what is the prevalence of X-linked recessive diseases?

a. Less common

b. Equally common

c. More common

d. Cannot be determined

Q8. Why are women somewhat protected from X-linked disorders?

a. They have two X chromosomes

c. They have more autosomes

b. They have one X and one Y chromosome

d. They lack the gene for X-linked disorders

How many mutant X chromosomes are needed for a female to express X-linked recessive diseases?

a. None

c. Two

b. One

d. Three

C 7. What term is used to describe females who carry the gene for a disorder but do not express the disorder themselves?

a. Expressors

c. Carriers

b. Dominants

d. Affected

a 8. What is the inheritance pattern in X-linked recessive diseases for sons of an affected mother?

a. All sons are affected

b. None of the sons are affected

c. Only the first-born son is affected

d. Sons have a 50% chance of being affected

II. PROBLEM SOLVING. Solve the following multiple alleles and sex-linked trait problems. Set up Punnet squares for each of the crosses given below on a separate sheet of paper.

MULTIPLE ALLELES:

9-13: It was suspected that two babies had been exchanged in a hospital. Mr. and Mrs. Jones received baby #land Mr. and Mrs. Simon received baby #2. Blood typing tests on the parents and the babies showed the following:

Mr. Jones: Type A

Mrs. Jones: Type O

Baby #1: Type A

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Answer 1

The information provided does not include any questions or problems related to multiple alleles and sex-linked traits.