Problem
1:
Hemophilia in humans is due to
an X-chromosome
mutation. What will be the results of mating between a normal
(non-carrier) female and a hemophilac male? Show your reasoning.
Problem
2:
A human female "carrier"
who is heterozygous for the recessive, sex-linked trait causing
red-green color blindness marries a normal male. What proportion of
their male progeny will have red-green color blindness? Show your
reasoning.
A. 100%
B. 75%
C. 50%
D. 25%
E. 0%
Problem
3:
Given: Women have sex
chromosomes of XX,
and men have sex chromosomes of XY.
Which of a women's grandparents could not be the source of any of the genes on either of her X-chromosomes? Show your reasoning.
A. Mother's Father.
B. Father's Mother.
C. Mother's Mother.
D. Father's Father.
E. Mother's Mother and Mother's Father.
Problem
4:
A human female "carrier"
who is heterozygous for the recessive, sex-linked trait red color
blindness, marries a normal male.
What proportion of their female progeny will show the trait? Show your reasoning.
A. All
B. 1/2
C. 1/4
D. 0
E. 3/4