Punnett Practice

1
Punnett Practice
3
T. Trimpe 2008 http//sciencespot.net/
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Some people have dimples, while others do not.
The presence of dimples is a dominant trait (D),
while not having dimples is recessive (d). (1)
Susie has dimples, but her husband, Tom, does
not. Their first child has his father's
phenotype. What are the genotypes of the mother,
father, and child? Mothers Genotype
_______ Fathers Genotype _______ Sons
Genotype _______ (2) What is the probability
that a second child wont have dimples? Create a
Punnett square to support your answer.
3
Some people have dimples, while others do not.
The presence of dimples is a dominant trait (D),
while not having dimples is recessive (d). (1)
Susie has dimples, but her husband, Tom, does
not. Their first child has his father's
phenotype. What are the genotypes of the mother,
father, and child? Mothers Genotype
_______ Fathers Genotype _______ Sons
Genotype _______ (2) What is the probability
that a second child wont have dimples? Create a
Punnett square to support your answer.
Dd
dd
dd