Question

A husband and wife have normal vision, although both of the couple's fathers are red-green color-blind, an inherited X-linked recessive condition.

Answer 1

The probabilities are given below:

• The probability that the first son is normal is 1/4
• probability first daughter is normal = 1/2
• Probability = 1/4

How to solve for the probability

For females we have the following data

50% = normal,  50% = carriers; 100%= normal vision

50% males = color blind ;50% = normal

a.The probability of having a normal first son

p(first son)  = ½

Prob( normal)= ½

=½ x ½

= 1/4 0r 0.25

b . probability first daughter is normal

Probability of the first being a girl  = ½

Prob(normal ) =  1

½ x 1 = 1/2

c. color blind

= 1/2 x 1/2

= 1/4

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Complete question

A husband and wife have normal vision, although both of the couple's fathers are red–green color-blind, an inherited X-linked recessive condition.

A)What is the probability that the couple's first child will be a normal son? Enter your answer as a fraction

B)What is the probability that the couple's first child will be a normal daughter? Enter your answer as a fraction

What is the probability that the couple's first child will be a color-blind son?