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Genotype, Phenotype, & Punnett Squares

Total questions: 20

Worksheet time: 2hrs 40mins

Name
Class
Date
1.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)

lower case

d)

weaker 

2.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
3.
G = green, g = yellow
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)

g

4.

B = brown fur  b = white fur
If two heterozygous parents reproduce, what is the probability that the offspring will have white fur?

a)
0%
b)
25%
c)
50%
d)
75%
5.

Which of the following genotypes is homozygous recessive?

a)
Tt
b)
tt
c)
TT
d)
t
6.

Two brown eyed parents with the genotype Bb have a baby. What is the chance the baby has blue eyes?

a)
0 %
b)
25%
c)
50%
d)
75%
7.

Aa, DD, and yy are all examples of

a)
genotypes
b)
phenotypes
8.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
9.
Aa is
a)
homozygous
b)
heterozygous
10.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
11.

Genotype refers to...

a)
physical expression of the genes
b)
the possible combination of alleles in a gene
c)
whether an allele is dominant or recessive
d)
how an organism will appear
12.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)

both yellow and green are dominant

13.
Which statement best supports why many offspring look similar to their parents?
a)
Offspring inherit characteristics from one parent.
b)
Offspring inherit characteristics from both parents.
c)
Parents choose which characteristics to pass on to their offspring.
d)
Parents choose to change their appearance to match that of their offspring.
14.

If the dominant trait is having freckles (F) and the recessive trait is no freckles (f), which allele combination(s) below would represent a person who has freckles? (select all that apply)

a)

FF

b)

Ff

c)

ff

15.

What belongs in the last box?

a)

RR

b)

Rr

c)

rr

d)

ff

16.

Look at the punnett square. What is the probability that the offspring would have a homozygous genotype?

a)

100%

b)

75%

c)

50%

d)

25%

e)

0%

17.

If red petals are dominant in flowers, what would a homozygous dominant flower's genotype look like?

a)

RR

b)

Rr

c)

rr

18.

Hair is dominant to no hair. A guinea pig who is hairless will have which genotype?

a)

HH

b)

Hh

c)

hh

d)

heterozygous

19.

Cindy's genotype is Gg and her husband's genotype is homozygous recessive. What are all of the possible genotype(s) of Cindy and her husband's future child? **SELECT ALL THAT APPLY**

a)

GG

b)

Gg

c)

gg

20.

Straight hairlines are recessive and widow's peak harilines are dominant. If a man who is homozygous dominant reproduces with a woman with a straight hairline, what are the possible genotype(s) of their children? **SELECT ALL THAT APPLY**

a)

HH

b)

Hh

c)

hh