When a Single-Gene Mutation Can Have Phenotypic Effects at Multiple

question 31

Multiple Choice

When a single-gene mutation can have phenotypic effects at multiple stages of development,it is

• A)pleiotropic.
• B)incompletely dominant.
• C)recessive.
• D)causing a disease.
• E)X-linked.

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Definitions:

Phallic Stage

A phase in Freudian psychosexual development where a child's focus of libido is on the genital area and begins to identify with the same-sex parent.

Mother

A female parent who has given birth to, raised, or nurtured a child.

Erogenous Zone

Specific areas of the body that are particularly sensitive to touch and can lead to sexual arousal when stimulated.

Infancy

The earliest period in human development, extending from birth to approximately 2 years of age, characterized by rapid physical and cognitive growth.