Punnett Squares

Use the Punnett square to answer the question that follows.

In a monohybrid cross between two organisms heterozygous for a particular trait (Ff), what would be the predicted ratio of the offspring’s genotypes?

• A 1 FF: 3 Ff: 1 ff

• B 1 FF: 2 Ff: 1 ff

• C 2 FF: 2 Ff

• D 3 Ff: 1 ff

Tags

NGSS.HS-LS3-3

The Punnett square shows the cross between cabbage butterflies. B = white and b = yellow.

Why are all the offspring white?

• A Both parent butterflies were dominant for white color.

• B Only one parent butterfly carried recessive yellow traits.

• C Only one parent carried dominant and recessive color genes.

• D Both parent butterflies carried recessive genes for yellow color.

Tags

NGSS.MS-LS3-2

A homozygous dominant black angelfish (BB) is crossed with a homozygous recessive gold angelfish (bb). What is the probability their offspring will be gold?

• A 0%

• B 25%

• C 75%

• D 100%

A red flowered plant (RR) is crossed with a white flowered plant (WW) and produces plants with pink flowers (RW). If two pink flowered plants are crossed, what color offspring could be produced?

• A red, white, and pink

• B red and white

• C pink and red

• D pink and white

Tags

NGSS.MS-LS4-4

NGSS.MS-LS3-2

In a gerbil population, the gene for coarse hair (H) is dominant, while the gene for smooth hair (h) is recessive. One pet store found that most of their customers want coarse-haired gerbils. Which cross between male and female gerbils will produce the greatest number of coarse-haired offspring?

• 
• 
• 
• 

A snapdragon plant with red flowers (RR) is crossed with a snapdragon plant with white flowers (WW). Snapdragon flowers show incomplete dominance. A Punnett square of the cross is shown below.

If the cross produces four offspring, how many of each color flower would likely be produced?

• A four red flowers

• B four pink flowers

• C two red flowers and two pink flowers

• D two white flowers and two pink flowers

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Allele A is dominant in mice and allele a is recessive. Two mice with the gene combination Aa breed and produce four offspring as shown below.

Which offspring has the recessive phenotype?

• A 1

• B 2

• C 3

• D 4

Which best describes what a Punnett square determines?

• A the mathematical probability that DNA has a mutation

• B the mathematical probability that a trait will be inherited

• C the mathematical probability that offspring will survive to reproduce more offspring

• D the mathematical probability that a child will have larger feet than either the father or mother

Tags

NGSS.HS-LS3-3

A Punnett square without the genotypes of the parents is shown below.

What are the genotypes of the parents?

• A Cc, cc

• B CC, cc

• C Cc, Cc

• D CC, Cc

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The diagram below shows a parental cross. What is the probability of each offspring?

• A 100% red

• B 100% white

• C 50% red and 50% white

• D 75% red and 25% white

Tags

NGSS.HS-LS3-3

NGSS.HS-LS4-3