Punnett Square Test2
Part 1- Vocabulary
Directions: Choose the term that best fits the description.
# 1-7 answer choices
a) dominant b) recessive
1.
2.
3.
4.
5.
6.
7.
c) genotype d) phenotype
Being tall or short are examples
BB, Bb, and bb are examples
The genes or instructions for a trait
The form of the gene that is “weaker” and can be hidden by another allele
The form of the gene that is “stronger” and appears more often
Is represented by letters
The expression of a gene
# 8-11 answer choices
a) heterozygous
b) homozygous
8. bb is an example
9. BB is an example
10. Would look like the recessive trait
11. Would look like the dominant trait
Part 2- Fill In
Directions: Choose Punnett square that is set up correctly.
12. Which is the correct way to complete the punnett square?
B
B
B
B
B
B
b
BB
BB
bb
bb
b
a.
b
b
BB
Bb
Bb
bb
b.
b
b
Bb
Bb
Bb
Bb
c.
13. Which is the correct way to complete the punnett square?
B
b
Bb
b
Bb
B
b
b
Bb
bb
Bb
bb
b
b
Bb
Bb
a.
b.
B
b
b
b
a.
BB
Bb
Bb
bb
B
b
b.
BB
BB
Bb
Bb
c.
14. Which is the correct way to complete the punnett square?
B
b
B
b
B
b
BB
bb
BB
bb
B
b
c.
B
b
BB
Bb
BB
Bb
Part 3- Reading a Punnett Square
Directions: #15-18 Use the following punnett square and use it to answer the questions below.
#15-18 answer choices
a) 100%
b) 75%
B
c) 50%
d) 25%
e) 0%
B = Brown eyes
b = blue eyes
b
B
b
15. What is the probability of having a child with brown eyes?
16. What is the probability of having a child with blue eyes?
17. What is the probability of a heterozygous child?
18. What is the probability of a homozygous child?
_________________________________________________________________________
Part 4- Setting up a Punnett Square
Directions: Use the description of the parents to set up a punnett square.
19. Which would be the correct way to set up a punnett square is mom is homozygous dominant and
dad is homozygous recessive?
B
B
B
b
B
B
B
b
B
b
a.
b
b
b.
c.
20. Which is the correct way to set up the punnett square if mom is heterozygous and dad is
homozygous dominant?
B
b
b
b
B
B
b
B
b
b
b
a.
b.
b
c.
Part 5- Punnett Squares from Start to Finish
Directions: Answer the following word problems.
21. If mom and dad both have blue eyes, what is the probability of their child having brown eyes? (B =
Brown eyes, b = blue eyes)
a) 100%
b) 75%
c) 50%
d) 25%
e) 0%
22. If mom is homozygous dominant and dad is homozygous recessive, what is the probability of their
child having brown eyes? (B = Brown eyes, b = blue eyes)
a) 100%
b) 75%
c) 50%
d) 25%
e) 0%
23. If mom is heterozygous and dad has blue eyes, what is the probability of their child having brown
eyes? (B = Brown eyes, b = blue eyes)
a) 100%
b) 75%
c) 50%
d) 25%
e) 0%
24. If mom is homozygous dominant and dad heterozygous, what is the probability of their child having
brown eyes? (B = Brown eyes, b = blue eyes)
a) 100%
b) 75%
c) 50%
d) 25%
e) 0%
25. If mom and dad are both heterozygous, what is the probability of their child having brown eyes?
(B = Brown eyes, b = blue eyes)
a) 100%
b) 75%
c) 50%
d) 25%
e) 0%