The Pedigree Below Shows the Segregation of an Autosomal Recessive

question 17

Multiple Choice

The pedigree below shows the segregation of an autosomal recessive trait in humans.Unless there is evidence to the contrary, assume that individuals who marry into the family do not carry the recessive allele.If IV-1 and IV-2 marry, what is the probability that their first child will have this trait?

• A)1/16
• B)1/6
• C)3/64
• D)1/9
• E)1/24

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Definitions:

Color Constancy

The perceptual property by which the color of an object appears the same under varying lighting conditions.

Sunglasses

Eyewear designed to protect the eyes from excessive sunlight and UV rays.

Nociceptors

Specialized sensory receptors that detect pain and are activated by potentially harmful stimuli.

Pain

An unpleasant sensory and emotional experience associated with actual or potential tissue damage.