Free Printable Punnett Squares

Worksheets

Punnett Squares

Total questions: 25

Worksheet time: 39mins

Name

Class

Date

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

recessive

dominant

both

Which of the following alleles is purebred recessive?

Aa, DD, Ba, and yy are all examples of ---

genotypes

phenotypes

Which of the following genotypes is homozygous dominant?

Which of the following genotypes is heterozygous?

Why do scientist use Punnett Squares?

A tool scientist use to to see alleles

A tool scientist use to see which alleles are dominant

A tool scientist use to determine possible genotypes for offspring

Fill in the Yellow Box

The punnett square is used to tell the color of a frogs skin. "G" means green skin and "g" means brown skin. What is the chance the baby frogs will have brown skin?

25%

50%

100%

10.

In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?

Tall = T
Short = S

Tall = T
Short = t

Tall = t
Short = T

Tall = TT
Short = tt

11.

Identify the homozygous dominant genotype:

12.

Heterozygous is when...

the alleles are the same

the alleles are different

the alleles are absent

the alleles are present

13.

Dominant alleles are represented by a:

Male gene

lowercase letter

recessive trait

capital letter

14.

Aa is

homozygous

heterozygous

15.

Which of the following is a phenotype?

red hair

heterozygous

DNA

16.

What is a punnett square?

graph used to predict the possible genotypes of offspring in a given cross

a graph used to predict the possible birth rate of offspring.

a graph used to predict the possible behavioral characteristics an offspring could have

None of the above

17.

In a punnet square where are the parent alleles written?

Top and inside the boxes

Only on the left and right side of the boxes.

outside of the boxes (top and left side)

All on the top side of the boxes

18.

Genotype refers to the ...

physical expression of the genes

the possible combination of alleles in a gene

whether an allele is dominant or recessive

how an organism will appear

19.

What is the dominant trait?

yellow pea seeds

green pea seeds

there is no dominant seed

Jolly green giant

20.

What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness?

0 in 4

1 in 4

2 in 4

4 in 4

21.

What you see, or the physical appearance.

Genotype

Phenotype

Homozygous

Heterozygous

22.

T - tall and t = short

In the punnett square below, what belongs in the missing square

23.

Which of these characteristics would not be passed on to its offspring?

fur color

length of tail

scars on leg

body size

24.

What is the genotypic ratio of the offspring?

3:1

1:3

1:2:1

2:2

25.

Who is considered the "father of genetics"?

Reginald Punnett

Gregor Mendel

James Watson

Charles Darwin

100 %

Punnett Squares

Total questions: 25

Worksheet time: 39mins

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