If a Is Dominant to a and B Is Dominant

question 53

Multiple Choice

If A is dominant to a and B is dominant to b, what is the expected phenotypic ratio of the cross AaBb × AaBb?

• A) 16:0:0:0
• B) 8:4:2:2
• C) 1:1:1:1
• D) 9:3:3:1

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Definitions:

Motor Neurons

Nerve cells that initiate and conduct signals from the brain or spinal cord to muscles or glands, resulting in movement or action.

Acetylcholine

A neurotransmitter in both the peripheral and central nervous system that plays a key role in muscle activation and memory functions.

Skeletal Muscles

The muscles attached to bones that are responsible for voluntary movements of the body.

GABA

Gamma-Aminobutyric Acid, an inhibitory neurotransmitter in the brain that helps regulate nerve cell activity.