Consider the F₂ Progeny of a Dihybrid Cross

question 13

Multiple Choice

Consider the F₂ progeny of a dihybrid cross.For every double recessive homozygote observed, you should expect _______ double dominant homozygote(s) .

• A) 1/9
• B) 1/3
• C) 1
• D) 3
• E) 9

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Definitions:

Higher-order Conditioning

A conditioned response is linked to a new stimulus by associating the new stimulus with a previously conditioned stimulus.

Conditioned Stimulus

A previously neutral stimulus that, after association with an unconditioned stimulus, comes to trigger a conditioned response.

Neutral Stimulus

A stimulus that initially produces no specific response other than focusing attention before it is associated with an unconditioned stimulus.

Extinction

The process through which a conditioned response is weakened by presenting the conditioned stimulus without the unconditioned stimulus.