Summative Practice Chapter 11 – Question 2 (Form 5 Biology Textbook Exercise and Answer)

Question 2:
A man has normal eyesight whereas his wife is colour blind. XB is a dominant allele for normal eyesight whereas Xb is a recessive allele for colour blindness. What is the probability of their children having:
(a) Colour blindness?
(b) Normal eyesight but a carrier?
Explain your answers using a schematic diagram.

Schematic diagram for colour blindness trait:

(a) 50%
(b) 50%

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