4.15 Trait Inheritance

What is the term used to describe the physical appearance of an organism as a result of its genotype?

• Genotype

• Phenotype

• Allele

• Trait

What does it mean if an organism is homozygous for a trait?

• It has two different alleles for a trait.

• It has two identical alleles for a trait.

• It expresses both dominant and recessive traits.

• It does not express the trait at all.

Which of the following best describes incomplete dominance?

• The phenotype of the heterozygote is exactly the same as the dominant homozygote.

• The phenotype of the heterozygote is a blend of the dominant and recessive phenotypes.

• Both alleles are fully and equally expressed in the phenotype of the heterozygote.

• The recessive allele is completely masked by the dominant allele in the heterozygote.

In the context of codominance, what is observed in the phenotype of the heterozygote?

• Only the dominant trait is expressed.

• The traits blend together to form a new phenotype.

• Both alleles are fully and equally expressed.

• The recessive trait is completely masked.

If a plant species exhibits incomplete dominance for flower color, and R represents red, r represents white, what color flowers would you expect from a cross between two Rr plants?

• All red

• All white

• A mix of red, white, and pink

• All pink