1) Which of the following genotypes due to nondisjunction of sex chromosomes is lethal?
a. XXX
b. XXY
c. OY
d. XO
2-Color blindness is caused by a sex-linked, recessive gene. If a woman, whose father was color blind, marries a man with normal color vision, what percentage of their children will be color blind? Assume the woman herself is not colorblind. What percentage of male children will be color blind? What percentage of female children will be color blind?