Question

A family has a history of colour blindness. During a genetic testing, it was found that the mother is a carrier of colour blindness (X^C X) and the father has normal vision (XY). What is the probability of their sons being colour blind?

विकल्प

• 25%

• 50%

• 75%

• 0%

Answer 1

50%

Explanation:

Given:

Mother: Carrier → X^C X

Father: Normal → XY

Punnett square for sons (XY):
Mother\Father	X	Y
XC	XC Y	XC Y
X	XY	XY

Sons get Y from father and X or X^C from mother.

Probability of sons being colour blind (X^C Y) = 50%