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Q.

Color-blindness is X-linked disorder in humans. A colorblind man married a normal visioned woman whose mother is color-blind. What is the probability of their children becoming colorblind?

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a

1

b

$\frac{1}{2}$

c

$\frac{1}{4}$

d

$\frac{3}{4}$

answer is B.

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Detailed Solution

The genotype of color-blind man = $X^{c} Y$ ;

The genotype of normal vision woman = $X^{C} X^{c}$ ;

The genotype of her color-blind mother= $X^{c} X^{c}$

X^{c}

Y

X^{C}

$X^{C} X^{c}$

Normal vision carrier female

$X^{C} Y$

Normal vision male

X^{c}

$X^{c} X^{c}$

Color-blind female

$X^{c} Y$

Color-blind male

$\frac{1}{2}$ of offspring will be colorblind.

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Color-blindness is X-linked disorder in humans. A colorblind man married a normal visioned woman whose mother is color-blind. What is the probability of their children becoming colorblind?