Snail Species a Has a Shell That Spirals Counterclockwise,but a Mutation

question 60

Multiple Choice

Snail species A has a shell that spirals counterclockwise,but a mutation has caused some individuals to have a clockwise shell.The genitalia of the two versions are incompatible,leading some scientists to say that the clockwise snails are reproductively isolated.This is an example of

• A) hybrid breakdown.
• B) gametic isolation.
• C) hybrid inviability.
• D) mutational isolation.
• E) mechanical isolation.

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Definitions:

Reality Principle

A psychoanalytic concept that represents the ability of the mind to assess the external world and act upon it realistically, as opposed to the pleasure principle.

Ego

In psychoanalytic theory, it represents the part of the mind that mediates between the conscious and the unconscious and is responsible for reality testing and a sense of personal identity.

Freud

Sigmund Freud, an Austrian neurologist and the founder of psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst.

Ego

The Freudian construct representing the self, or the part of one's personality that is involved in decision making and reality testing.