Question
18. Why is color blindness more common in males than in females? F The allele for color blindness is recessive and located on the X chromosome. G Color blind males have two copies of the allele for color blindness. H The allele for color blindness is located on the Y chromosome. J Fathers pass the allele for color blindness to their sons only.
Answer
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Aneira
Master · Tutor for 5 years
Answer
F. The allele for color blindness is recessive and located on the X chromosome.
Explanation
Color blindness is a sex-linked trait, specifically X-linked. This means the gene responsible for this condition is located on the X chromosome. Males (XY) have only one X chromosome while females (XX) have two. Since the allele for color blindness is recessive, a female needs two copies of this allele (one on each X chromosome) to exhibit the trait. However, males only need one copy of the allele on their single X chromosome to express color blindness. Therefore, males are more likely to be color blind.