What Is the Key to the Recognition of Codominance

question 53

Multiple Choice

What is the key to the recognition of codominance?

• A)The phenotype of the heterozygote is intermediate between the phenotypes of the homozygotes.
• B)The trait exhibits a continuous distribution.
• C)The alleles affect more than one trait.
• D)The heterozygote expresses the phenotype of both homozygotes.

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Definitions:

Metronome

A device used to mark time at a selected rate by giving a regular tick sound.

Biscuit

A baked food item, typically flour-based, that varies significantly between regions; in the U.S., it refers to a soft bread roll, while in the U.K. it is akin to what Americans call a cookie.

Extinction

In psychology, the gradual weakening and eventual disappearance of a conditioned response when the conditioned stimulus is repeatedly presented without the unconditioned stimulus.

CR Fading

A technique in classical conditioning by which the conditioned response (CR) is gradually weakened by presenting the conditioned stimulus (CS) without the unconditioned stimulus (US).