. A recessive allele on the X chromosome is responsible for red-green color blindness in humans. This means that females have two copies (since human females are XX) and males have one copy (since human males are XY). This is called a sex-linked trait. A red-green color blind male is genotype Xn Y. A normal vision male is genotype XN Y. For this problem, a normal vision woman whose father is color-blind marries a color-blind male. N= not color blind allele, n = color blind allele. Y = Y chromosome.
a. What is the genotype of the color-blind father? Why?
b. What is the genotype of the color-blind husband? Why?
c. What is the genotype of the normal vision woman? Why?
d. What is the probability that this couple will have a son that is color-blind?
e. What is the probability that this couple will have a daughter that is color-blind?
. A recessive allele on the X chromosome is responsible for red-green color blindness in humans. This means that females have two copies (since human females are XX) and males have one copy (since human males are XY). This is called a sex-linked trait. A red-green color blind male is genotype Xn Y. A normal vision male is genotype XN Y. For this problem, a normal vision woman whose father is color-blind marries a color-blind male. N= not color blind allele, n = color blind allele. Y = Y chromosome.
a. What is the genotype of the color-blind father? Why?
b. What is the genotype of the color-blind husband? Why?
c. What is the genotype of the normal vision woman? Why?
d. What is the probability that this couple will have a son that is color-blind?
e. What is the probability that this couple will have a daughter that is color-blind?
