Figure 13.1 -In a Drosophila Experiment,a Cross Was Made Between Homozygous Wild-Type

question 25

Multiple Choice

Figure 13.1
-In a Drosophila experiment,a cross was made between homozygous wild-type females and yellow-bodied males.All of the resulting F₁s were phenotypically wild type.However,adult flies of the F₂ generation (resulting from matings of the F₁s) had the characteristics shown in the figure above:
(a) Is the mutant allele for yellow body recessive or dominant?
(b) Is the yellow locus autosomal (not X-linked) or X-linked?

• A)(a)recessive;(b)X-linked
• B)(a)recessive;(b)not X-linked
• C)(a)dominant;(b)X-linked
• D)(a)dominant;(b)not X-linked

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Definitions:

Primary Reinforcers

Stimuli that are inherently rewarding and satisfy basic biological needs, such as food, water, and warmth, leading to the conditioning of behavior without prior learning.

Secondary Reinforcers

Stimuli or rewards that have learned value through their association with primary reinforcers, such as money or praise.

Biological Needs

Fundamental requirements that serve to maintain the basic functioning and survival of an organism, including food, water, shelter, and air.

Shaping

A method of behavior training in which successive approximations of the desired behavior are reinforced until the exact behavior is achieved.