Question

Colorblindness is sex recessive A female who is heterozygous for -green color blindness normal male. What is the chance the boys wil be colorblind Do the Punnett Square!

Answer 1

The correct answer is - 50% of boys will be colorblind.

Step-by-step 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%