The Discovery of a Gene in Aplysia Slugs That Results

question 55

Multiple Choice

The discovery of a gene in Aplysia slugs that results in protein products including egg-laying hormone is evidence that

• A)the egg-laying behavior is innate or hardwired into the slugs' brain.
• B)the egg-laying behavior has absolutely no nervous system involvement.
• C)genes can control endocrine gland secretions that can control behavior.
• D)this slug could avoid being eaten by garter snakes.
• E)genes only influence physiology and structure but not behavior.

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Definitions:

Umbilical Cord

The flexible cord-like structure connecting a fetus to the placenta, delivering nutrients and removing waste.

Placenta

A structure that forms in the uterus while pregnant, which supplies the fetus with oxygen and nourishment while eliminating its waste.

Developing Organism

refers to an organism in the stages of growth and development, from conception through to maturity.

Amnion

A thin, tough, transparent membrane that holds the amniotic fluid and surrounds the embryo.