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Punnett Squares

Total questions: 20

Worksheet time: 18mins

Name
Class
Date
1.
In the Punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
2.
B = brown fur  b = white fur
In the Punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
3.
What are the possible genotypes for this cross?
(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%
4.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
5.
What genotype would go in box 3?
a)
BB
b)
Bb
c)
bb
6.
What genotype would go in box 1?
a)
BB
b)
Bb
c)
bb
7.

The blending of two traits is known as ---

a)

incomplete dominance

b)

codominance

8.

A condition in which both alleles for a gene are expressed so that both traits are visible is known as ---

a)

Codominance

b)

Incomplete dominance

9.

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

a)

Incomplete dominance

b)

Codominance

10.

If you cross a black chicken with a white chicken, only black and white checkered chickens would be produced. What kind of inheritance pattern does this follow?

a)

Incomplete dominance

b)

Codominance

11.

This is an example of ---

a)

Incomplete dominance

b)

Codominance

12.

What does this Punnett square and the probabilities of the ofspring represent?

a)

incomplete dominance

b)

codominance

13.

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

14.

The combination of genes a person has, represented by letters, is their...

a)

Genotype

b)

Phenotype

c)

Chromosome

d)

Punnett Square

15.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
16.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
17.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 
a)
50 % Brown Hair and 50% Blond Hair 
b)
25 % Brown Hair and 75% Blond Hair 
c)
75 % Brown Hair and 25% Blond Hair 
d)
0% Brown Hair and 100% Blond Hair 
18.

The letters that make-up the genetic code for a trait

a)

genotype

b)

heterozygous

c)

phenotype

d)

trait

19.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
20.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4