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?
In this scenario, the man is heterozygous (Tt) for the tongue-curling trait, and the woman is also heterozygous (Tt). Let's consider the possible genotypes and phenotypes of their children.
The possible genotypes of their children can be determined using a Punnett square. Crossing the alleles from the father (Tt) with the alleles from the mother (Tt) results in the following combinations:
| T | t |
----------------
T | TT | Tt |
----------------
t | Tt | tt |
The genotypes that can be produced are TT, Tt, Tt, and tt.
- TT (25% chance): Homozygous dominant genotype resulting in the phenotype of tongue-curling.
- Tt (50% chance): Heterozygous genotype resulting in the phenotype of tongue-curling.
- tt (25% chance): Homozygous recessive genotype resulting in the non-tongue curling phenotype.
Thus, there is a 25% chance of having a child with TT genotype and tongue-curling phenotype, a 50% chance of having a child with a Tt genotype and tongue-curling phenotype, and a 25% chance of having a child with tt genotype and a non-tongue curling phenotype.