The System in the Illustration Functions To

question 51

Multiple Choice

The system in the illustration functions to:

• A) provide support and movement.
• B) perpetuate the species.
• C) pump nutrients, oxygen, carbon dioxide, and chemical messengers throughout the body.
• D) cycle gases into and out of the body.

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Definitions:

Allele Frequencies

A measure of the relative frequency of an allele (variant of a gene) at a genetic locus in a population, expressed as a proportion or a percentage.

Directional Selection

The gradual replacement of one phenotype with another because of environmental change that favors phenotypes at one of the extremes of the normal distribution. Compare with stabilizing selection and disruptive selection.

Phenotypes

The set of observable characteristics or traits of an organism resulting from the interaction of its genotype with the environment.

Normal Distribution

A bell-shaped frequency distribution curve, where most occurrences take place in the middle of the distribution and taper off on either side.