Genetics and Heredity Worksheet

Round (R) is dominant to wrinkled (r) in pea seeds. Which of the following represents a genotype of a pea seed that is heterozygous for roundness?

• R

• RR

• Rr

• rr

In pea plants, tall stems are dominant to short stems. Which of the following is a phenotype of these stems?

• Tall

• Homozygous dominant

• Heterozygous

• Homozygous recessive

Tags

NGSS.HS-LS3-2

A scientist is studying Mendel's law of segregation. She is investigating a heritable trait where the allele (T) represents tall plants and the recessive allele (t) represents short plants. Only plants that are homozygous recessive will be short. She creates a Punnett square to show the probabilities of a first generation cross between two heterozygous (Tt) plants as shown below. Which question can the scientist answer using the Punnett square?

• What are the genotypes of the parent plants?

• How many of the offspring will be heterozygous for the trait?

• How many tall plants will be male?

• How many future generations will show the short trait?

Tags

NGSS.HS-LS3-2

A pedigree is shown below. What could the shaded square represent?

• A son who expresses a dominant disorder

• A daughter who expresses a dominant disorder

• A son who expresses a recessive disorder

• A daughter who expresses a recessive disorder

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A student draws a Punnett square where two parents are heterozygous for freckles are crossed. Freckles (F) are dominant to no freckles (f). Using the Punnett square, what is the percent chance that the offspring will have freckles?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-3

Two corn plants are crossed while considering both the height of the plant and the color of the kernels. This is an example of what type of genetic cross?

• Monohybrid cross

• Complex inheritance cross

• Dihybrid cross

• Test cross

In a dihybrid cross for pea plants, Y is dominant for yellow plants, y is recessive for green plants, R is dominant for round, and r is recessive for round. What statement can be accurately made about the offspring of this cross?

• Half of the offspring will be yellow and green.
• There is no chance of green offspring

• All offspring will be green and round.
• All offspring will be homozygous Yellow and Round

Tags

NGSS.HS-LS3-1

If an individual possesses two dominant alleles for the same trait, the individual is said to be

• homozygous dominant.

• heterozygous.

• homozygous recessive.

• mutated.

Yellow seed color is a dominant trait in pea plants. If 1,000 seeds from a pea plant are germinated to produce 740 yellow-seeded plants and 260 green-seeded plants, what are the MOST LIKELY genotypes of the parents?

• Yy x Yy

• Yy x yy

• YY x Yy

• YY x yy

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A family has one girl. What is the chance that the next child will be a boy?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-3