One type of colorblindness is a recessive, sex-linked trait that is carried on the X chromosome. If a colorblind woman and a man who is not colorblind had children, what chance would there be that their son would be colorblind?

25 percent

0 percent

100 percent

50 percent

Question

One type of colorblindness is a recessive, sex-linked trait that is carried on the X chromosome. If a colorblind woman and a man who is not colorblind had children, what chance would there be that their son would be colorblind?

 25 percent

 0 percent

 100 percent

 50 percent

anonymous · Answer

@shrutipande9 help plez

aaronq · Answer

Since it's carried on the sex chromosomes and recessive, their genotypes are:

woman $X^hX^h$

man $X^hY$

make a punnett square|dw:1406161162588:dw|

So any son they have will carry the $X^h$ allele and be colourblind.