Color blindness is a recessive X-linked trait. A female with normal vision, whose father was color blind, marries a man with normal vision. What are the chances of them having:

a) A color blind daughter?
b) A color blind son?
c) If a male is color blind, from which parent did he inherit this trait? Explain.

(Note: 3 marks)

In an X-linked recessive trait scenario, a female carrier having a child with a normal visioned man has a 50% chance of having both colour blind daughter and son. The affected son inherits the trait from the carrier mother due to the recessive nature of X-linked traits.

Explanation:

Colour blindness is a recessive X-linked trait that primarily affects males. In this scenario, if a female carrier of the trait has a child with a normal visioned man, the chances of having a colour blind daughter are 50% as she would inherit a defective X chromosome from both parents (XX), making her affected. The probability of having a colour blind son is also 50% as the son will inherit the mother's affected X chromosome. A male who is colour blind inherited the trait from his carrier mother as females need to inherit two copies of the recessive allele to express the X-linked recessive trait.

Learn more about X-linked recessive inheritance here:

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