The ability to roll the tongue is caused by a dominant allele.A woman is a "roller, " but one of her parents is not.What is the woman's genotype?
A)Homozygous dominant
B)Heterozygous
C)Homozygous recessive
D)Either homozygous recessive or homozygous dominant
E)Cannot be determined from this information

Question

Quizplus · Accepted Answer

Since the ability to roll the tongue is determined by a dominant allele, it means that if the woman is a "roller," she must have at least one copy of the dominant allele. This means that she could either be homozygous dominant (RR) or heterozygous (Rr). Since one of her parents is not a "roller," it is more likely that the parent is homozygous recessive (rr). If this is the case, the woman's genotype would be heterozygous (Rr).

The Ability to Roll the Tongue Is Caused by a Dominant