In humans, blue eyes are inherited as a recessive autosomal trait and color blin
ID: 20441 • Letter: I
Question
In humans, blue eyes are inherited as a recessive autosomal trait and color blindness is an X-linked recessive trait. A woman with blue eyes and normal color vision whose father was color blind marries a man who also has normal color vision. He has brown eyes but his mother had blue eyes. Which of the following do you expect to be true for their daughters?
a)One-fourth of their daughters will be color blind and have blue eyes, 1/4 of their daughters will be color blind and have brown eyes, 1/4 of their daughters will have normal color vision and blue eyes, 1/4 of their daughters will have normal color vision and brown eyes.
b) Their daughters will all have normal color vision and brown eyes.
c)Their daughters will all have normal color vision and have blue eyes.
d)One-half of their daughters will be color blind and have blue eyes; 1/2 their daughters will be color blind and have brown eyes
e) One-half of their daughters will have normal color vision and brown eyes; 1/2 of their daughters will have normal color vision and blue eyes.
Explanation / Answer
n humans, blue eyes are inherited as a recessive autosomal trait and color blindness is an X-linked recessive trait. A woman with blue eyes and normal color vision whose father was color blind marries a man who also has normal color vision. He has brown eyes, but his mother had blue eyes. Which of the following do you expect to be true for their sons? One-half of their sons will be color blind and have blue eyes; 1/2 their sons will be color blind and have brown eyes. One-fourth of their sons will be color blind and have blue eyes, 1/4 of their sons will be color blind and have brown eyes, 1/4 of their sons will have normal color vision and blue eyes, 1/4 of their sons will have normal color vision and brown eyes. Their sons will all have normal color vision and blue eyes. Their sons will all have normal color vision and brown eyes. One-half of their sons will have normal color vision and brown eyes; 1/2 of their sons will have normal color vision and blue eyes. blue eyes are inherited as a recessive autosomal trait color blindness is an X-linked recessive trait. A woman with blue eyes and normal color vision--------genotype---------bbXCX man brown eyes, AND normal color vision-------------------genotype---------BbXY BX BY bX bY bXC bXC BX brown eyes, female bXC BY brown eyes, male colorblind bXC bX blue eyes female bXC bY blue eyes male colorblind bXC bXC BX brown eyes, female bXC BY brown eyes, male colorblind bXCBx blue eyes female bXC bY blue eyes male colorblind bX bX BX brown eyes, female bX BY brown eyes, male bX bX blue eyes female bX bY blue eyes male bX bX BX brown eyes, female bX BY brown eyes, male bX bX blue eyes female bX bY blue eyes male