Unit 6 Test Review 2022

Which term describes the form of a gene that produces a specific trait, such as eye color?

• gamete

• chromosome

• allele

• chromatid

Which term refers to a type of trait that is usually expressed only when an organism has two identical alleles for the trait?

• heterozygous

• recessive

• dominant

• homozygous

Which of the following best describes the relationship between a gene and an allele?

• An allele is a variant of a gene.

• A gene is always dominant to an allele.

• A gene is always recessive to an allele.

• A gene is a variant of an allele.

What do the letters in each box of a Punnett square tell you?

• how to assemble a genetic map of the chromosome on which alleles are located

• that both parents show characteristics of the dominant trait

• the parents of a set of offspring

• the possible combinations of alleles in offspring based on the parents' genetic makeup

When using punnett squares to determine the patterns of inheritance of an organism, the phenotype of an individual is determined by his or her ______________.

• genotype.

• mother's allele only.

• father's allele only.

• codominance.

Suppose you cross a homozygous blue flower with a homozygous yellow flower. In the next generation, all of the flowers are blue. What does this outcome tell you about the allele for blue flowers?

• The blue allele is recessive to the yellow allele.

• The blue allele is dominant to the yellow allele.

• The blue allele is sex-linked.

• The blue allele shows incomplete dominance.