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WorksheetsPunnett Squares
Total questions: 20
Worksheet time: 13mins
Name
Class
Date
1.
If T=Tall & t=short, what is the genotypic ratio?
a)
1:3
b)
3:1
c)
1:2:1
d)
2:2
2.
B = brown fur b = white fur
In the Punnett square, what is the probability for white fur?
In the Punnett square, what is the probability for white fur?
a)
0%
b)
25%
c)
50%
d)
75%
3.
In the Punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
4.
A heterozygous yellow pea plant's genotype would be:
a)
YY
b)
yy
c)
Yy
d)
Yg
5.
B - black, b - brown. Two black mice mate and have some black and some brown mice. What is the genotype of the parents?
a)
BB x Bb
b)
BB x bb
c)
Bb x Bb
d)
Bb x bb
6.
What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness?
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
7.
What are the possible genotypes for this cross?
(Click the picture to see it without the text)
(Click the picture to see it without the text)
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
8.
In the Punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
9.
B = brown fur b = white fur
In the Punnett square, what is the probability for white fur?
In the Punnett square, what is the probability for white fur?
a)
0%
b)
25%
c)
50%
d)
75%
10.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being white?
According to the Punnett Square, what is the probability of an offspring being white?
a)
25%
b)
0%
c)
100%
d)
50%
11.
Purple (P) is dominant to the white (p).
According to the Punnett Square, what is the probability of an offspring being purple?
According to the Punnett Square, what is the probability of an offspring being purple?
a)
25%
b)
0%
c)
100%
d)
50%
12.
What is the yellow seed genotype?
a)
aa
b)
Aa
c)
AA
d)
AA or Aa
13.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
14.
What is the genotypic ratio here?
a)
25% blue eye 75 % brown eye
b)
BB = 25% Bb = 50% bb = 25%
c)
BB= 50 % bb = 50%
d)
All brown eye
15.
What does a Punnett Square do?
a)
tell you exactly what your offspring will look like
b)
increase the chance you pass on recessive traits
c)
predict genotypes and phenotypes in offspring
d)
have no purpose but for Taylor to give us extra assignments
16.
What genotype would go in box 2?
a)
BB
b)
Bb
c)
bb
17.
What genotype would go in box 3?
a)
BB
b)
Bb
c)
bb
18.
What genotype would go in box 1?
a)
BB
b)
Bb
c)
bb
19.
Which of the following is homozygous dominant?
a)
Jj
b)
Rr
c)
MM
d)
ee
20.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
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