Huntington's Disease Is an Autosomal Dominant Trait

question 40

Multiple Choice

Huntington's disease is an autosomal dominant trait. Given the pedigree below, if individual IV- 2 has three children with a normal man, what is probability that exactly two of the three children would have the disorder?

• A) 3/8
• B) 7/8
• C) 0
• D) 1/2
• E) 1/8

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Definitions:

Transmitters

Chemical agents released by neurons that cross synapses to carry signals to other neurons or muscles.

Transporter Proteins

Proteins that move molecules across cell membranes, playing critical roles in nutrient uptake, neurotransmitter clearance, and waste removal.

Presynaptic Axon

The part of an axon that is situated at the presynaptic side of a synapse, responsible for releasing neurotransmitters.

Neurotransmitter

A chemical substance that transmits signals across a synapse from one neuron to another in the brain and nervous system.