In Aplysia

question 6

Multiple Choice

In aplysia:

• A)the neural connections involved in the gill-withdrawal reflex have been well mapped out.
• B)the nervous system consists of just 24 neurons.
• C)the neurons are smaller than normal.
• D)All of the answers are correct.

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Definitions:

Heterozygous Individual

A heterozygous individual possesses two different alleles of a gene for a particular trait, resulting in genetic variation.

Different Alleles

Variations or alternative forms of a gene that can exist at a single locus (position) on a chromosome.

Dominant Allele

An allele that expresses its phenotypic effect even when heterozygous with a recessive allele; it masks the effect of a recessive allele.

Heterozygous Individuals

Individuals having two different alleles at a particular genetic locus, one inherited from each parent.