Download Punnett Square Quiz

Punnett Square Quiz
For the following problems, identify the possible offspring genotypes and find the genotypic
and phenotypic ratios.
1) In mice, white fur is recessive to gray fur. Cross a white male with a heterozygous brown
female, and find the possible genotypic and phenotypic ratios.
Parent Genotypes: __________ x ___________
Genotypic Ratio: _______________________ Phenotypic Ratio: ________________________
2) A man who has the ability to roll his tongue marries a woman who cannot roll her tongue.
Both his parents were tongue rollers, and after genetic testing, he finds that he is homozygous
dominant for tongue rolling, while his wife is homozygous recessive. Before they have
children, he wants to find the possible genotypic and phenotypic ratios for their offspring. Help
him find the answer!
Parent Genotypes: __________ x ___________
Genotypic Ratio: _______________________ Phenotypic Ratio: ________________________
PROBLEM 1
Parent Genotypes
Parent Genotype Placement
Offspring Genotypes
Genotypic Ratio
x2
Phenotypic Ratio
x2
PROBLEM 2
Parent Genotypes
Parent Genotype Placement
Offspring Genotypes
Genotypic Ratio
x2
Phenotypic Ratio
x2
2
(Correct)
1
(Partially Correct)
0
(Incorrect)
2
(Correct)
1
(Partially Correct)
0
(Incorrect)