Yes, B is correct.
Colorblindness is caused by a recessive gene on the X chromosome. Females usually have two X chromosomes, while males usually only have one X chromosome and one Y chromosome. This means that females need two defective X chromosomes to catch colorblindness, but males only need one.
A woman gives birth to a set of fraternal twins: a girl and a boy. She also passes on a color-blindness gene. Which of the children is more likely to be color-blind? I think the answer is B.
A. The girl is more likely to be color-blind from birth
B. The boy is more likely to be color-blind from birth
C. The girl will never be color-blind because the gene came from her mother
D. The boy will never be color-blind because the gene came from his mother
1 answer
1 answer