Genetics Quiz Review

A female is born with attached earlobes, which is a recessive phenotype. Which of the following genotypes could her parents have?

• RR and RR

• Rr and RR

• Rr and rr

• RR and rr

Tags

NGSS.HS-LS3-1

Recessive alleles may not be expressed because they are

• masked by a dominant allele.

• the least common allele in a population.

• the most common allele in a population.

• less likely to have crossing over.

Human height occurs in a continuous range because it is affected by the interaction of several genes, making it a

• autosomal trait.

• sex-linked trait.

• polygenic trait.

• codominant trait.

Tags

NGSS.HS-LS3-3

Which of the following statements is true of homozygous alleles?

• They are always inherited together.

• They are different forms of the same trait.

• They are identical forms of the same gene.

• They are identical forms of two different genes.

Which of the following phrases describes the Punnett square in Figure 6.1?

• 1/4 probability of heterozygous offspring

• monohybrid heterozygous-heterozygous cross

• 3/4 probability of homozygous offspring

• dihybrid heterozygous-heterozygous cross

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In the case of codominant alleles, a plant that is homozygous for red flowers that is crossed with a plant that is homozygous for white flowers will produce flowers that are

• red and white spotted.

• completely white.

• dark pink all over.

• pink and red.

Tags

NGSS.HS-LS3-1

A plant that is homozygous for red flowers is crossed with a plant that is homozygous for white flowers. In the case of incomplete dominance, the flowers of the offspring will be

• red and white.

• white only.

• pink only.

• red only.

Genes that are located on sex chromosomes are called

• alleles.

• recessive.

• XY.

• sex-linked.

What do the letters inside the grid of a Punnett square represent?

• phenotypes of parents

• genotypes of offspring

• testcrosses of offspring

• chromosomes of parents

If a pea plant were homozygous recessive for height, how would its alleles be represented?

• Tt

• TT

• tt

• tT