Punnett Square Science Review

Which best describes what a Punnett square determines?

• the mathematical probability that DNA has a mutation

• the mathematical probability that a trait will be inherited

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

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

The diagram below shows a parental cross.

• 100% RED

• 100% white

• 50% red and 50% white

• 75% red and 25% white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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?

• 1 FF: 3 Ff: 1 ff

• 1 FF: 2 Ff: 1 ff

• 2 FF: 2 Ff

• 3 Ff: 1 ff

Tags

NGSS.HS-LS3-3

In some plants, red flowers are dominant (R) and white flowers are recessive (r). Two plants are crossed and the offspring have a possibility of red flowers and white flowers. Which Punnett square shows the cross and its offspring?

• 
• 
• 
• 

Freckles (F) are dominant to not having freckles (f). The diagram shows the cross of a homozygous dominant parent (FF) with a parent of an unknown genotype for freckles. What is the unknown genotype and phenotype for the parent?

• homozygous dominant with freckles

• homozygous recessive without freckles

• heterozygous with freckles

• heterozygous without freckles

Two black guinea pigs were crossed and they produced a litter of 4 black and 3 white guinea pigs. Which best explains this occurrence?

• White fur is dominant to black fur.

• White fur was the result of a mutation.

• Both parents were heterozygous for black fur.

• Both parents were homozygous for black fur.

Tags

NGSS.MS-LS3-2

NGSS.MS-LS4-4

The Punnett square shows the cross between cabbage butterflies. B = white and b = yellow. Why are all the offspring white?

• Both parent butterflies were dominant for white color.

• Only one parent butterfly carried recessive yellow traits.

• Only one parent carried dominant and recessive color genes.

• Both parent butterflies carried recessive genes for yellow color.

Tags

NGSS.MS-LS4-4

Results from a simple heredity investigation can be displayed as a Punnett square, as a ratio, or as a fraction. All three methods can be used because

• three results are possible from a simple hereditary investigation

• three generations of offspring can be produced in a simple hereditary investigation.

• all three methods can be used to show a different variation in the results.

• all three methods can be used to show the same information.

In one breed of dog, short hair is the dominant allele (H) while long hair is the recessive allele (h). If both parents have short hair and the offspring has long hair, which statement BEST describes the genetic characteristics of the offspring?

• The offspring received mutated genes from both parents.

• The offspring received one recessive allele from each parent.

• The offspring received one dominant allele from each parent.

• The offspring received a dominant and recessive allele from both parents.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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

• a graph

• a Punnett square

• a data table

• a flow chart

Tags

NGSS.MS-LS3-2