Download PUNNETT SQUARE PRACTICE PROBLEMS Example: There are

PUNNETT SQUARE PRACTICE PROBLEMS
Example: There are two parents. The father contains a dominant allele for brown hair (H) and a recessive allele for
blonde hair (h). The mother contains both dominant alleles for brown hair (H). Make a punnett square and to show
the probability of their child having either brown/blonde hair.
H
h
H
H
HH
Hh
HH
Hh
Genotype for Offspring: There are 2 sets of alleles with HH, and 2 sets of alleles with Hh
Phenotype for offspring: There is a 100% that the offspring will have brown hair, because the dominant gene will
overpower the recessive gene.
1. There are two parents. The father contains two recessive alleles for blue eyes (ee). The mother contains one
dominant allele for brown eyes and one recessive allele for blue eyes (Ee). Create a punnett square to show the
possible outcomes for their offspring. Include the genotype and phenotype.
2. Black fur (B) in guinea pigs is dominant over white fur (b). Find the probability of a black offspring in a cross: bb
x bb. Create a punnett square to show the possible outcomes for their offspring. Include the genotype and
phenotype.
3. Black fur (B) in guinea pigs is dominant over white fur (b). Find the probability of a black and white offspring in
a cross: BB x Bb. Create a punnett square to show the possible outcomes for their offspring. Include the genotype
and phenotype.
4. Black fur (B) in guinea pigs is dominant over white fur (b). Find the probability of a homozygous offspring in a
cross: BB x BB. Create a punnett square to show the possible outcomes for their offspring. Include the genotype and
phenotype.
5. SpongeBob Square pants recently met SpongeSusie Round pants at a dance. SpongeBob Square pants is
heterozygous (Ss) for his square shape, whereas SpongeSusie is homozygous (ss) for her circle shape. Please create
a punnett square showing the possible outcomes for their offspring. Include the genotype and phenotype.
6. Patrick met Patti while eating a crabby patty. Patrick is heterozygous (Pp) for his pink color, Patti is
homozygous for yellow (pp) Create a punnett square to show the possible outcomes for their offspring. Include the
genotype and phenotype.
7. M is dominant for no magical abilities and m is recessive for possessing magical abilities. If Harry Potter (mm)
married Ginny Weasley (mm), will their children have magical abilities? Please create a punnett square showing
the possible outcomes for their offspring. Include the genotype and phenotype.
8. Harry Potter, who has brown hair, marries Ginny, who has red hair. Brown hair (H) is dominant and red hair (h)
is recessive. Harry is homozygous for brown hair (BB) and Ginny is homozygous for red hair (rr). Create a punnett
square to show the possible outcomes for their offspring. Include the genotype and phenotype.
9. Squidward, who is heterozygous for light blue body color (dominant) married a girl who was also heterozygous
for a light blue body. (NOTE: light green body is recessive). Please create a punnett square to show the possible
outcomes for their offspring. Include the genotype and phenotype. (HINT: Use “B” to represent blue, or dominant,
and use “b” to represent green or recessive)
10. CREATE YOUR OWN! You and your partner will create your own punnett square practice problem. Once you
write it down on a sheet of paper, have your partner try to solve your question by completing a punnett square.
Include the genotype and phenotype.
**Always remember to include the GENOTYPE AND PHENOTYPE**