13. Mendelian Genetics
Sex-Linked Inheritance
Multiple Choice
Multiple ChoiceDuchenne muscular dystrophy is caused by a sex-linked recessive allele. Its victims are almost invariably boys, who usually die before the age of 20. Why is this disorder almost never seen in girls?
A
Sex-linked traits are never seen in girls.
B
The allele is carried on the Y chromosome.
C
Nondisjunction occurs in males but not in females.
D
A sex-linked allele cannot be passed from mother to daughter.
E
To express an X-linked recessive allele, a female must have two copies of the allele, one of which is contributed by the father.
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