Color blindness is an X-linked recessive trait. Under what conditions can an unaffected male have a color-blind daughter?
- He is heterozygous for color vision
- His father is color-blind
- His mother is color-blind
- He cannot
📝 Detailed explanation
A daughter must inherit one X chromosome from her father.An unaffected male has a dominant allele on his only X chromosome.
Since he passes this dominant allele to all daughters, they cannot express the recessive trait.