Question

a couple is expecting their first child. they possess the alleles shown in the punnett square for red - green color blindness. what is the probability that they will have a color - blind girl? 0% 25% 50% 75%

Explanation:

Step1: Determine the genotype for a girl

A girl has the genotype \(XX\). From the Punnett square, the possible genotypes for girls are \(X^{B}X^{B}\) and \(X^{B}X^{b}\).

Step2: Analyze color - blindness in girls

Color - blindness is a recessive X - linked trait. For a girl to be color - blind, her genotype must be \(X^{b}X^{b}\). Since there is no \(X^{b}X^{b}\) genotype among the possible genotypes for girls (\(X^{B}X^{B}\) and \(X^{B}X^{b}\)), the probability of having a color - blind girl is \(0\%\).

Answer:

0%