Question

Color blindness in humans is a sex-linked (X) recessive trait. If a colorblind male mates with a normal visioned female that carries the recessive allele, what percentage of their male offspring should be colorblind? What percentage of their female offspring will have normal vision?

Answer 1

The disoeder called color blindness is X linked recessive ondition in which the person canot see colors,usualy red and greem due to the abscence of pigmentgs in the eye which is responsible for visulaization of colors.As it is carried by X chromosom the male need sigle gene to express colorblindness and female need two gene to show colorblindness.

Female Normal-X^CX^C.

Colorblind female-X^cX^c

Color blind male-X^cY

Normal male-X^CY.

Carrier Female-X^CX^c

According to the question

Colorblind male(X^cY) X Carrier Female (X^CX^c)

X^C X^c

X^c X^CX^c X^cX^c

Carrier female Colorblinf female

Y X^CY X^cY

Normal male colorblind male

Phenotype ratio is 1:1:1:1

There is 25% chance of male to be colorblind,25% chance of male to be mormal,25% chance of female to be colorblind and 25% chance of female to be carrier.