1) For each of the genotypes (AA, Aa or aa) below determine what the phenotype would be.
Purple flowers are dominant to white flowers.
PP: Purple
Pp: Purple
pp: White
Hairy knuckles are dominant to non-hairy knuckles in humans.
HH: Hairy knuckles
Hh: Hairy knuckles
hh: Non-hairy knuckles
Bobtails in cats are recessive. Normal tails are dominant.
TT: Normal tail
Tt: Normal tail
tt: Bobtail
2) For each of the following write whether it is homozygous dominant, heterozygous or homozygous recessive.
AA: Homozygous dominant
gg: Homozygous recessive
Pp: Heterozygous
Ii: Heterozygous
tt: Homozygous recessive
TT: Homozygous dominant
Use the following information for questions 3-5:
In dogs, the gene for fur color has two alleles. The dominant allele (F) codes for grey fur and the recessive allele (f) codes for black fur.
3) The female dog is heterozygous. The male dog is homozygous recessive. Figure out the percentage or ratio of possible phenotypes and genotypes of their puppies by using a Punnett Square.
% of possible Genotypes:
FF: 0%
Ff: 50%
ff: 50%
% of possible Phenotypes:
Black fur: 50%
Grey fur: 50%
Parent Tip: Review the logic above to help your child master the concept of punnett square practice problems worksheet.
