Punnett Square review

If two parents are heterozygous for Red (R). What would be the genotypic ratio of their offspring?

• 2:2

• 3:1

• 1:2:1

• 4:0

Tags

NGSS.HS-LS3-1

If T is dominant for tall, what are the possible phenotypes of the offspring when the following parents are crossed: TT x tt?

• 50% tall and 50% short

• 100% tall

• 100% short

• 75% tall and 25% short

Two pink flowering plants are crossed. The offspring’s phenotypes are 75% red and 25% white. What is the phenotypic ratio?

• 3:1

• 2:2

• 1:2:1

• 4:0

Consider the Punnett Square Diagram to help you answer the question. In this type of rabbit, the allele for fluffy fur (F) is dominant over the allele for bristly fur (f). Which of the following describes all possible genotypes resulting from a cross between

Parent 1 and Parent 2?

• FF and ff

• FF, Ff, and ff

• Fluffy furred rabbits

• Bristly furred rabbits

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

How could crossing a white flower and a red flower produce plants with pink flowers?

• The pink flower has incomplete dominant red and white genes.

• The genes for red color and white color do not affect each other.

• The pink flower only gets the genes for color from one of the parent plants.

• The gene for pink color is in all flowers, but the genes for red and white color are only in some of the flowers.

You have 2 mice. One is white and the other is black. Their alleles are codominant. What will their offspring look like?

• white

• black

• gray

• white and black

In humans, having freckles is dominant to no freckles. Which of the following statements BEST describes the child represented in box 1 of the Punnett Square?

• Homozygous freckled

• Homozygous no freckles

• Heterozygous freckled.

• Heterozygous no freckles

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following genotypes has the potential for

the greatest genetic variation in the offspring?

• Homozygous dominant crossed with homozygous

  recessive.

• Heterozygous crossed with homozygous recessive

• Homozygous dominant crossed with homozygous

  dominant

• Heterozygous crossed with another heterozygous

  individual

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In pea plants, purple flowers are dominant to white flowers. Suppose a purple-flowered plant with genotype Pp is crossed with another purple-flowered plant with the same Pp genotype. What percentage of offspring will also have purple flowers?

• 25%

• 50%

• 75%

• 100%

The allele for black hair, B, is dominant to orange tabby color, b, in cats. Based upon the Punnett square shown above, what did the parents look like in this genetic cross?

• two tabby parents

• two black parents

• one black parent, one tabby parent

• both parents were a mix of black and tabby

Tags

NGSS.HS-LS3-1