Punnett Square Practice
Directions: Draw the Punnett squares for each situation and use it to answer all of
the questions asked. Be sure to show all of your work.
1. One female cat carries a heterozygous, long-haired genotype (Ss), and its
mate carries a homozygous, short-haired genotype (ss). Use a punnett
square to determine the probability of one of their offspring having long hair.
Determine the probability of one of their offspring having short hair.
2. One flower is heterozygous red (Rr) and it is crossed with a homozygous
white (rr) plant. Use a Punnett Square to determine the probability of one of
their offspring having a red color. Determine the probability of one of their
offspring having a white color.
3. In dogs, the recessive gene for deafness can be represented by (d). If the
mother has a homozygous dominant genotype (DD) and the father has a
homozygous recessive genotype (dd), then what is the probability that the
phenotype of the offspring will be deaf?
Family Trait Survey
Directions: Tonight, observe the traits that people in your family share. Record
your observations in the table. Describe the trait in the first column, identify the
family member’s name in the name boxes, and circle yes (Y) or no (N) for each trait.
Then, answer the questions following the table.
Trait
Name:
Name:
Name:
Name:
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
Y/N
1. Are there any traits that only one family member has? If so, which ones?
2. How many traits do you share with each person? (List the family member
and then the number of traits he or she shares with you)