Question

In humans, dark hair (D) is dominant over blond hair (d). If a heterozygous dark haired man had a son with his blond haired wife, what would the probability be that the son would have dark hair like his father?

Answer 1

If the wife is homozygous recessive, then there is a 50% chance that the son will have dark hair like his father.

Answer 2

The probability would be 50% that the son would have dark hair like his father.

Dominant and recessive traits

• Dominant and recessive traits exist when a trait has two different forms at the gene level.
• The trait that first appears or is visibly expressed in the organism is called the dominant trait.
• The trait that is present at the gene level but is masked and does not show itself in the organism is called the recessive trait.

In this case:

dark hair (D) is dominant over blond hair (d)

Thus, the probability that he would have dark hair like his father will be 50% as the wife is recessive.

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