Question

The pedigree chart represents the inheritance of color blindness through three generations. Color blindness is an X-linked recessive trait. If Sarah is expecting another child, what is the probability that it will be colorblind?

A) 25%

B) 50%

C) 75%

D) 0%

Answer 1

The probability of the child being colorblind depends on whether Sarah is a carrier of the colorblindness allele or not. If Sarah is a carrier, there is a 50% chance the child will be colorblind. If Sarah is not a carrier, the child will not be colorblind.

Step-by-step explanation:

The probability of Sarah's child being colorblind depends on whether Sarah is a carrier of the colorblindness allele or not. If Sarah is a carrier, there is a 50% chance that she will pass the allele to her child. If Sarah is not a carrier, there is no chance the child will be colorblind. Therefore, the probability of the child being colorblind can be either 50% (if Sarah is a carrier) or 0% (if Sarah is not a carrier).