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Punnett Squares

Total questions: 25

Worksheet time: 43mins

Name
Class
Date
1.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
2.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
3.
G = green, g = yellow
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
4.
In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?
a)
0%
b)
25%
c)
50%
d)
75%
5.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
6.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
7.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
8.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
9.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
10.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
11.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
12.
B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
13.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
14.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
15.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
16.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
17.

What gender has an X and a Y chromosome?

a)

male

b)

female

c)

both

d)

none

18.
In a punnet square where are the parent alleles written?
a)
Top and inside the boxes
b)
Only on the left and right side of the boxes. 
c)
outside of the boxes (top and left side)
d)
All on the top side of the boxes
19.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
20.

G=green scales; g= white scales

What offspring do you get when you cross a 2 heterozygous parents?

a)

GG, gg

b)

GG, Gg, gg

c)

Gg, GG

d)

Gg

e)

Gg, gg

21.

G=green scales; g= white scales

What offspring do you get when you cross a 2 heterozygous parents?

a)

2 green and 2 white

b)

3 green and 1 white

c)

1 green and 3 white

d)

4 green

e)

4 white

22.

D= dimples, d=no dimples

What offspring do you get from crossing a heterozygous parent with a homozygous recessive parent?

a)

25% dimples, 75% no dimples

b)

75% dimples, 25% no dimples

c)

50% dimples, 50% no dimples

d)

100% dimples

23.

Y= gray fur, y= red fur

What offspring do you get from crossing a heterozygous parent with a homozygous dominant parent?

a)

25% gray, 75% red

b)

75% gray, 25% red

c)

50% gray, 50% red

d)

100% gray

24.

W=wings, w=no wings

What off spring would you get from mixing homozygous dominant with homozygous recessive?

a)

WW & ww

b)

WW, Ww, ww

c)

Ww

d)

Ww, ww

e)

Ww, WW

25.

W=wings, w=no wings

What off spring would you get from mixing homozygous dominant with homozygous recessive?

a)

50% with wings, 50% no wings

b)

100% with wings, 0% no wings

c)

25% with wings, 75% no wings

d)

75% with wings, 25% no wings

e)

0% with wings, 100% no wings

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