Free Printable Punnett Squares 1

Worksheets

Punnett Squares 1

Total questions: 48

Worksheet time: 24mins

Name

Class

Date

In pea plants, round seeds (R) are dominant to wrinkled seeds (r). Which of the following represents the genotype of a pea plant that is heterozygous?

round

wrinkled

In pea plants, round seeds (R) are dominant to wrinkled seeds (r). Which of the following represents the genotype of a pea plant that is homozygous dominant?

round

wrinkled

In mice, black fur (B) is dominant to white fur (b). According to the Punnett square shown, the offspring in box 4 would:

be white.

be heterozygous.

be gray.

be homozygous.

If black fur is dominant and white fur is recessive, what genotype would an organism with white fur have?

In mice, black fur (B) is dominant to white fur (b). According to the Punnett square shown, how many offspring would be black?

What allele combination should go in the missing box?

none of these

T - tall and t = short
In the punnett square below, what belongs in the missing square

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 purple?

25%

100%

50%

In the punnett square shown, what must the genotype of the missing parent be?

10.

How is the Punnett Square set up?

Parents genotypes on the inside and offspring is on the outside

The genotypes of each parent are on the sides and the offspring is in the boxes

Grandparents genotypes on the sides and offspring in the box

11.

What is the probability of heterozygous offspring?

25%

50%

100%

12.

Aa, DD, bB, yy are all examples of

genotypes

phenotypes

13.

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

14.

Which of the following genotypes is homozygous dominant?

15.

Which of the following genotypes is heterozygous?

16.

What you see, or the physical appearance.

Genotype

Phenotype

Homozygous

Heterozygous

17.

Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?

25%

10%

18.

T - tall and t = short
In the punnett square below, what belongs in the missing square

19.

What are the possible phenotype(s) of the offspring? (A-Brown hair; a-blond hair)

50 % Brown Hair and 50% Blond Hair

25 % Brown Hair and 75% Blond Hair

75 % Brown Hair and 25% Blond Hair

0% Brown Hair and 100% Blond Hair

20.

Brown eyes are dominant over blue eyes. What is the probability that the offspring will have brown eyes in this cross?

25%

50%

75%

100%

21.

What should students use to identify the percent chance of a trait being passed down from a parent to its offspring?

a graph

a flow chart

a data table

a Punnett square

22.

Which statement best supports why many offspring look similar to their parents?

Offspring inherit characteristics from one parent.

Offspring inherit characteristics from both parents.

Parents choose which characteristics to pass on to their offspring.

Parents choose to change their appearance to match that of their offspring.

23.

When the allele combination is a dominate and a recessive trait together which trait will be seen?

Dominate

Recessive

none

both

24.

Homozygous is when...

the alleles are the same

the alleles are different

the alleles are absent

the alleles are present

25.

What is a phenotype?

The expression of a trait; physical appearance.

refers to the genetic makeup of an individual

An organism that has the same genes for a trait (ex. TT or tt)

the passing of traits from parent to offspring

26.

This means Different Gene

Dominant

Recessive

Homozygous

Heterozygous

27.

Which of the following is a phenotype?

red hair

heterozygous

DNA

28.

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

29.

Who was the Austrian monk that experimented on pea plants and is called the "father of genetics"? (a)

Choose from the below words

Gregor Mendel

Charles Darwin

Francis Crick

James Watson

30.

Different versions of a trait (tall or short, white or purple) are called

alleles

traits

versions

genes

31.

If something is heterozygous, it is also _____

purebred

hybrid

dominant

recessive

32.

Which of the following is homozygous recessive?

33.

A green pea plant (Gg) is crossed with a yellow pea plant (gg). Describe the genotype of the offspring.

50% heterozygous and 25% homozygous recessive

50% heterozygous and 50% homozygous recessive

100% homozygous recessive

25% heterozygous and 50% homozygous

34.

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%

35.

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

BB Heterozygous

Bb Heterozygous

bb Homozygous

Bb Homozygous

36.