Name:__________________ Date:_______
Punnett Square Practice Worksheet
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_____________ Pp____________ pp_______________
Hairy knuckles are dominant to non-hairy knuckles in humans.
HH_____________ Hh ___________ hh _________________
Bobtails in cats are recessive. Normal tails are dominant.
TT _____________ Tt _________ tt _____________
2) For each of the following write whether it is homozygous dominant, heterozygous or
homozygous recessive.
AA __________________ gg ______________________
Pp ___________________ Ii _______________________
tt____________________ TT ______________________
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: ________
Ff: ________
ff: _________
% of possible Phenotypes:
Black fur: __________
Grey fur: ___________
_______
_______
_______
_______
Place the alleles for the male parent
below. One allele on each line:
Place the alleles for the
female parent on the
side. One allele on
each line:
