Two people (both heterozygotes)are able to taste a chemical substance called PTC. The ability to taste PTC is caused by a dominant allele (T). The inability to taste PTC is caused by a recessive allele (t). What proportion of their children would be expected NOT to be able to taste PTC?
A)3/4
B)All
C)1/4
D)2/3

Question

Quizplus · Accepted Answer

Since both parents are heterozygotes (Tt), the probability of their children inheriting the tt genotype (and thus not being able to taste PTC) is 1/4, based on a Punnett square analysis.

Two People (Both Heterozygotes)are Able to Taste a Chemical Substance