Question

John can roll his tongue and is heterozygous for this dominant trait (Rr). John’s second toe is shorter than his first. His wife Rita cannot roll her tongue and has a longer second toe. Rita is heterozygous for this dominant trait (Tt). Use a Punnett square to predict the possible genotype(s) and phenotype(s) of their first child?

Answer 1

Answer:

       rT       rt

Rt    RrTt     Rrtt

rt     rrtt        rrtt

25% chances for the genotype to be heterozygous roll tongue and heterozygous longer second toe.

25% chances for the genotype to be heterozygous roll tongue and homozygous short toe.

50% chances for the genotype to be  homozygous recessive no roll tongue and homozygous recessive short toe.

Phenotypes would be 25% tongue roll with longer toe. 25% tongue roll with shorter toe. 50% no tongue roll,shorter toe.