Free Printable Punnett Squares

Worksheets

Punnett Squares

Total questions: 20

Worksheet time: 18mins

Name

Class

Date

What are the possible genotypes for this cross?

TT = 25% Tt= 50% tt=25%

all tall

TT= 75% tt = 25%

Tt = 100%

Which of the following genotypes is homozygous dominant?

If brown eyes are dominant over blue eyes, what would be the parent genotypes if two heterozygous brown eyed persons were crossed?

BB and bb

BB and Bb

Bb and Bb

bb and Bb

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

Incomplete Dominance

Codominance

Independent assortment

Recessive inheritance

A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have pink (RW) flowers?

25%

50%

100%

This type of inheritance pattern shows BOTH traits in possible offspring

complete dominance

incomplete dominance

codominance

dominant pattern

A green pea plant (Gg) is crossed with a yellow pea plant (gg). Describe the genotype of the offspring. (Be sure to remember that the capital letter is dominant).

50% heterozygous and 25% homozygous recessive

50% heterozygous and 50% homozygous recessive

100% homozygous recessive

25% heterozygous and 50% homozygous

A white flower (rr) is crossed with a white flower (rr). What is the genotype of the offspring? Draw a Punnett square and answer the question.

100% homozygous dominant

100% heterozygous dominant

100% homozygous recessive

100% heterozygous recessive

Which of the following is homozygous recessive?

10.

Which of the following is homozygous dominant?

11.

The physical appearance of a trait is known as the-

genotype

phenotype

Homozygous

intelligence

12.

Gretford is heterozygous for his head shape. If (R) is for a Round head, and (r) is for an Egg head, what is Gretford's genotype?

13.

What is the probability of heterozygous offspring?

25%

50%

100%

14.

In plants, tall (T) is dominant to short (t).

Draw a punnett square and perform the following cross: Tt x Tt

What is the probability of producing a short plant?

25%

50%

75%

15.

What allele combination should go in the missing box?

none of these

16.

What genotype would go in box 2? And is it Homozygous or Heterozygous?

BB Heterozygous

Bb Heterozygous

bb Homozygous

Bb Homozygous

17.

Kyree is heterozygous. If (W) is for waves, and (w) if for no waves.

What is Kyree’s genotype & phenotype?

WW : waves

ww : waves

Ww : no waves

Ww : Waves

18.

Which of the following alleles is homozygous (purebred) recessive?

19.

Brown eye color is dominant to blue eyes. Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

0 %

25%

50%

75%

20.

Aa, DD, bB, yy are all examples of

genotypes

phenotypes

100 %

Punnett Squares

Total questions: 20

Worksheet time: 18mins

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