Bellringer 2-28

Which of the following represents a heterozygous genotype?

• AA

• aa

• Aa

• AB

A homozygous recessive genotype is shown by which of the following?

• TT

• Tt

• tt

• TS

A homozygous dominant pea plant with purple flowers is crossed with a homozygous recessive pea plant with white flowers. Which of the following correctly describes the offspring?

• homozygous with purple flowers

• heterozygous with purple flowers

• homozygous with white flowers

• heterozygous with white flowers

Which of the following is NOT true about a recessive gene trait?

• It is expressed when the genotype is heterozygous

• It can be masked by a dominant gene trait.

• It is expressed only when a dominant gene isn't present.

• It can be expressed when the genotype is homozygous.

In Mendel's pea plants, the trait for yellow peas was dominant, Y, and the trait for green peas was recessive, y. Which of the following possible genotypes is NOT possible for pea color.

• YY

• yy

• Yy

• YG

Which of the following best describes Mendel's Law of Dominance?

• When an organism has two different alleles of the same gene, both genes will be expressed equally in the organism

• When an organism has two different alleles of the same gene, one of the genes will be expressed and the other will be hidden.

• When an organism has two of the same alleles for a gene, that allele is always dominant.

• When an organism has two of the same alleles for a gene, the stronger of the two genes will be expressed in the organism.