Punnett Squares and Genetics

In horses, black (B) is the dominant color; brown (b) is the recessive color. Consider the cross seen here, between two black horses (Bb). What is the probability that these two horses will have a foal that is brown?

• 0%

• 25%

• 40%

• 50%

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NGSS.HS-LS3-2

NGSS.HS-LS3-3

Consider the possible genotypes of the offspring of two heterozygous brown goats. The ratio of brown to white offspring in this case would be

• 1:3

• 2:2

• 3:1

• 3:4

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

In pole beans, green pods (G) are a dominant trait, while yellow pods (g) are a recessive trait. A bean plant with a GG genotype is crossed with a second plant that has the gg genotype. If this cross produces 500 offspring, approximately how many of the offspring will have green pods?

• 0

• 125

• 250

• 500

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

White coat (W) is dominant over tan (w) coat in foxes. When a white-coated male is mated with a tan-coated female, 100% of their offspring are white-coated. What is the genotype of the female fox?

• WW

• Ww

• wW

• ww

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NGSS.HS-LS3-1

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The Punnett square shown presents a cross between two piranha. Both parents have large teeth.

According to the chart, which combination describes the offspring expected from the cross?

• 50% large-toothed and 50% small-toothed

• 75% small-toothed and 25% large-toothed

• 75% large-toothed and 25% small-toothed

• 100% large-toothed

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Two genetically identical plants were crossed. The genotypic ratios of offspring are seen in the Punnett square.

What percent of the offspring should look like the parents?

• 0%

• 25%

• 50%

• 75%

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NGSS.HS-LS3-1

NGSS.HS-LS3-3

The Punnett square above shows a cross between two sweet pea plants in Mendel's greenhouse. Both parents have blue flowers (Bb).

Which statement describes the offspring expected from this cross?

• 50% white-flowered and 50% blue-flowered

• 75% white-flowered and 25% blue-flowered

• 75% blue-flowered and 25% white-flowered

• 100% blue-flowered and 0% white-flowered

Tags

NGSS.HS-LS3-1

A female cat has two recessive genes for long fur (ss) and a male cat has two dominant genes for short fur (SS). What is the likelihood the two cats produce a kitten with short fur?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Among a species of butterflies, the color blue (B) is a dominant trait. Yellow color (b) is a recessive trait. If a pure blue butterfly (BB) mates with a pure yellow (bb), what will the offspring look like?

• They will all be blue.

• They will all be yellow.

• Half will be blue and half will be yellow.

• About 75% will be blue and 25% will be yellow.

Tags

NGSS.HS-LS3-1

A trait is a feature or quality of an organism. All organisms have a unique set of traits that they inherit from their parents. Each parent supplies one half of the __________ needed to determine the traits of their offspring.

• centromeres

• chromosomes

• karyotypes

• nuclei

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2