Free Printable Punnett Squares

Worksheets

Punnett Squares

Total questions: 20

Worksheet time: 23mins

Name

Class

Date

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

A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?

25%

50%

75%

A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?

25%

50%

75%

What is the probability of a purple-horned unicorn if a heterozygous pink-horned unicorn is crossed with a heterozygous pink-horned unicorn?

25%

50%

75%

Leonardo bet his friend Olivet that two heterozygous green-eyed sea monsters could not have a recessive blue-eyed baby sea monster. Olivet said they can have a blue-eyed sea monster.
Who wins the bet?

Leonardo

Olivet

Both

Neither

Identify the homozygous dominant genotype:

Complex molecule that carries genetic information that defines an organism's traits. It is stored in the nucleus.

Protein

DNA

RNA

Glucose nucleic acid (GNA)

Dominant alleles are represented by a:

Male gene

lowercase letter

recessive trait

capital letter

Aa, DD, bB, yy are all examples of

genotypes

phenotypes

10.

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

recessive

dominant

lower case letter

both

11.

What you see, or the physical appearance.

Genotype

Phenotype

Homozygous

Heterozygous

12.

T - tall and t = short

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

13.

B = brown eyes

b = blue eyes

One brother has genotype BB and the other brother has genotype Bb.

Which statement is true about these two brothers?

They have same phenotype and genotype

They have different phenotypes and genotypes

They have same phenotype, but different genotypes

They have different phenotypes, but the same genotype

14.

The genotype Aa is called . . .

Homozygous recessive

Hybrid

Purebred

Homozygous dominant

15.

Which of the following would be a phenotype?

red hair

heterozygous

DNA

16.

Which of the following genotypes is Purebred? Select 2 answers.

17.

Which of the following genotypes is heterozygous?

18.

Which of the following genotypes is homozygous dominant?

19.

Which of the following genotypes is homozygous recessive?

20.

In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any white-flowering plant resulting from this species?

100 %

Punnett Squares

Total questions: 20

Worksheet time: 23mins

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