Ask and Answer Questions Inheritance

What does Tt for the trait of plant height?

• a homozygous genotype

• a heterozygous genotype

• a homozygous phenotype

• a heterozygous phenotype

Which term describes an organism that has identical alleles for a trait?

• homozygous

• heterozygous

• dominant

• recessive

The offspring of a particular cross are 100 percent heterozygous for the trait of plant height. What were the most likely genotypes of the parents?

• Tt x tt

• Tt x Tt

• tt x tt

• TT x tt

Tags

NGSS.HS-LS3-1

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Mendel crossed two plants that were heterozygous for the trait of flower color. Which genotypes could he have used to represent the cross?

• PP x PP

• Pp x Pp

• pp x pp

• Pp x PP

In pea plants, tallness (T) is dominant to shortness (t). What are the predicted percentages of the genotypes of the offspring if a homozygous short plant is crossed with a heterozygous tall plant?

• 25 percent Tt, 75 percent tt

• 25 percent tall, 75 percent short

• 50 percent Tt, 50 percent tt

• 50 percent tall, 50 percent short

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which term describes the physical characteristics of an organism?

• gene

• allele

• genotype

• phenotype

The Punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. In this cross, tallness (H) is dominant to shortness (h).

Based on the Punnett square, what is the phenotype of the offspring?

• Hh

• HH

• tall

• short

Tags

NGSS.HS-LS3-1

The Punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. The Punnett square below examines the chance of offspring having freckles, which is a dominant trait.

Based on the Punnett square, what is the probability that the offspring will have freckles?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

There are two different alleles for flower color, P and p. The image shows a white sweet pea that is labeled with its two alleles for petal color.

What can you surmise from the labeled image?

• The genotype is heterozygous.

• White petal color is a recessive trait.

• White petal color is a dominant trait.

• The phenotype is heterozygous.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

There are two different alleles for flower color, P and p. The image shows a purple sweet pea that is labeled with its two alleles for petal color.

Which is the genotype of the sweet pea?

• heterozygous dominant

• heterozygous recessive

• homozygous dominant

• homozygous recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2