Genetics and Meiosis 6 weeks Review

What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds (Y)?

• RrYy

• RRyy

• RRYy

• rryy

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

In peas, round is dominant to wrinkled and yellow is dominant to green. Work the 2 monohybrid crosses and multiply the ratios find what fraction of the offspring will have wrinkled, yellow seeds. Use scratch paper to solve.

• 9/16

• 3/16

• 1/16

• 16/16

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In peas, round is dominant to wrinkled and yellow is dominant to green. Based on this dihybrid cross, what fraction of the offspring will have wrinkled, green seeds? Use scratch paper to solve.

• 9/16

• 3/16

• 1/16

• 16/16

Tags

NGSS.HS-LS3-3

A mouse with red eyes is crossed with a mouse with brown eyes. The red-eyed mouse is recessive. The black-eyed mouse is homozygous dominant.

Which of the following shows the possible genotypes of their offspring?

• EE, Ee and ee

• Ee

• EE and ee

• EE and Ee

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

What fraction of offspring from the cross AaBB x Aabb will be heterozygous for both traits? Use scratch paper to solve.

• 1/16

• 4/16

• 8/16

• 3/16

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb? Use scratch paper to solve.

• 100%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

NGSS.HS-LS3-3

In cattle the allele for cloven hooves (H) is dominant over the allele for mule-foot hooves (h).

What is the probability of cloven hooves in the offspring of parents that are heterozygous for the trait? Use scratch paper to solve.

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Chickens can have different types of feathers. Frizzled feathers curl toward a chicken’s head. Assume that feather type is determined by a single gene and that the allele for frizzled feathers is dominant over the allele for straight feathers. In a cross between two chickens with straight feathers, what percentage of the offspring can be expected to have frizzled feathers? Use scratch paper to solve.

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what is the expected outcome of crossing two tomato plants that are heterozygous for hairy stems? Use scratch paper to solve.

• 75% hairy stems: 25% hairless stems

• 100% hairy stems

• 100% hairless stems

• 50% hairy stems: 50% hairless stems

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

NGSS.HS-LS3-3

In purple flowers, the allele for purple color (P) is dominant over the allele for white color (p). If a heterozygous purple flower is crossed with a white flower, which of the following genotypic ratios can be expected?

• 1 PP: 2 Pp: 1 pp

• 0 PP: 2 Pp: 2 pp

• 2 PP: 0 Pp: 2 pp

• 2 PP: 1 Pp: 0 pp

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1