Question

4. A couple has four children, one son and three daughters. What is the chance that the fifth child will be a
daughter?
A. 1/4
B. 1/2
C. 3/4
D. 1/5

5. A man is colorblind but there is no history of this disorder in his wife's family. What is the chance that
their son is color blind?
A. O
B. 25%
C. 75%
D. 100%

6. What is a sex-linked trait that results in the inability to have normal blood clotting?
A. baldness
B. color blindness
C. diabetes
D. hemophilia

7. Melvin's thinning hair is like that of his father. This characteristic of baldness is due to____.
A. multiple alleles
B. sex-linked
C. sex-influenced
D. sex-limited

8. Color-blindness is inherited as a sex-linked recessive trait. If a normal woman, carrier of the gene marries a man with normal color vision. What would be the expected phenotype of their children with reference to color-blindness?

A. All color-blind
C. 1 normal, 3 carriers
B. 2 carriers, 2 color-blind
D. 2 normal, 1 carrier, 1 color-blind
​

Answer 1

Answer:

A

B

A

A

C hope it helps you