At Least a _____% Change in MAs Is Necessary to Produce

question 12

Multiple Choice

At least a _____% change in mAs is necessary to produce a visible change in optical density.

• A) 10
• B) 15
• C) 30
• D) 50

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Definitions:

Mechanical Isolation

A prezygotic reproductive isolating mechanism in which fusion of the gametes of two species is prevented by morphological or anatomical differences.

Sexual Isolation

A prezygotic barrier where different species are unable to mate successfully due to behavioral, physiological, or environmental differences.

Behavioral Isolation

A prezygotic reproductive isolating mechanism in which reproduction between similar species is prevented because each group exhibits its own characteristic courtship behavior; also called sexual isolation.

Gametic Isolation

A prezygotic reproductive isolating mechanism in which sexual reproduction between two closely related species cannot occur because of chemical differences in the gametes.