Question

We are pretending that tongue-curling in humans is a dominant genetic trait.

Suppose a man who is Tt for tongue-curling marries a woman who is also Tt for this trait. What are the possible genotypes and phenotypes of their children, and the percent chance for each?

Genotype Phenotype (curl or no curl) Percent Chance (number only)
TT 25 25
Tt 75 50
tt 75 25
Word Bank:
curl100507525no curl 25 curl 0

Answer 1

Genotypes: 1 TT, 2 Tt, 1tt

Phenotype chances: 75 percent curl, 25 percent no-curl

Genotype chances: 25 percent TT, 50 percent Tt, 25 percent tt

Step-by-step explanation:

The possible genotypes of this cross are:

1 TT, 2 Tt, 1 tt

So, for this problem, each offspring has a 75 percent chance of having the curl phenotype and a 25 percent chance of not having the no-curl phenotype.

Each offspring has a 25 percent chance of having the TT genotype, a 50 percent chance of having a Tt genotype, and a 25 percent chance of having a tt genotype.

Hope this helps.