Answer:
The correct answer is - 50% of boys will be colorblind.
Explanation:
Colorblindness is an X-linked recessive disorder which means it will affect a female if present in both X chromosomes whereas in males there is only one X chromosome so even one chromosome with the mutated gene will cause the disorder.
Cross: heterozygous female (XHXh) with a normal man (XHY)
gametes: XH Xh and XH Y
Punnett:
XH Y
XH XHXH XHY
Xh XHXh XhY
male color blind ratio: 1/2 = 50%
