Peter, a junior high school student, is color-blind. Why is Peter, a boy, more likely than a girl to be color-blind?
What will be an ideal response?
The ideal answer should include:
1. Color blindness is caused by a recessive allele on the X chromosome.
2. Boys have only one X chromosome, while girls have two.
3. Boys are more likely to be color-blind than girls because they only need inherit one allele on an X chromosome, whereas girls must inherit two recessive alleles.
4. The recessive allele on the X chromosome is expressed as color blindness in boys because there is no corresponding allele on the Y chromosome.
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