Suppose You Discover a New Variant in Which Mice Have

question 80

Multiple Choice

Suppose you discover a new variant in which mice have spiky fur instead of the usual soft fur.You notice that this trait seems only to be present in males.To investigate this pattern,you cross a spiky-fur male with a soft-fur female,and find that all of the F₁ progeny of both sexes have soft fur.You then interbreed the F₁ and observe that all of the F₂ females have soft fur,but 1/4 of the F₂ males have spiky fur.You conclude that the spiky allele is

• A) an X-linked recessive.
• B) Y-linked.
• C) an autosomal recessive with sex-limited expression.
• D) an X-linked dominant.
• E) an autosomal dominant with sex-limited expression.

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Definitions:

Retrieving

The process of getting information out of memory storage.

Core Knowledge Perspective

A theory in developmental psychology that suggests children are born with innate knowledge systems or core domains of thought.

Innate Knowledge Systems

Cognitive structures present at birth that allow individuals to acquire knowledge, often considered a part of the nature versus nurture debate.

Reflexive Behaviors

Automatic, instinctual actions that do not require conscious thought, often present from birth.