Punnet Square Problems: Answers

 

1.         Parent genotypes: Male RR x Female rr

            Offspring potential genotypes: all Rr

            Offspring potential phenotypes: all round

 

2.         Parent genotypes: Male ss x Female Ss

            Offspring potential genotypes: Ss, ss in a 1:1 ratio

            Offspring potential phenotypes: half straight, half curled

 

3.         Parent genotypes: Male Ee x Female Ee

            Offspring potential genotypes: 1 EE: 2 Ee: 1 ee

            Offspring potential phenotypes: 3 erect ears for every 1 droopy ear in the litter

 

4.         Parent genotypes: Male ssrr x Female SSrr

            Offspring potential genotypes: all Ssrr

            Offspring potential phenotypes: all straight toes, not able to roll tongue

            A child who could roll the tongue could not be produced from these two parents: someone might want to ask for a paternity test!

 

5.         Parent genotypes: Striped: PW x White: WW

            Offspring potential genotypes: half PW, half WW

            Offspring potential phenotypes: half striped, half white