Why are X-linked recessive traits, such as red-green colour blindness, more common in males than in females?
Answer and explanation
Correct answer: B. Males have one X chromosome
- Step 1: A male is XY and has one copy of X-linked genes. Step 2. A single recessive allele is expressed. Answer: males have only one X. Why not the others: males do not have two X chromosomes, and females can be carriers.
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