Polydactyly Is a Dominant Trait That Results in Extra Fingers

question 80

Multiple Choice

Polydactyly is a dominant trait that results in extra fingers and toes in humans.A man with polydactyly marries a woman with 10 fingers and toes.They have a child that has a normal number of digits.The phenotype of the man's father is unknown,but his mother has a normal phenotype.What are the genotypes of the married couple? (D = polydactyl allele;d = wild type allele)

• A)woman Dd,man dd
• B)woman DD,man dd
• C)woman dd,man DD
• D)woman dd,man Dd
• E)woman DD,man Dd or dd

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Definitions:

Depresses Mandible

The action that lowers the lower jaw, typically involving muscles like the digastric muscle.

Temporalis

A broad, fan-shaped muscle on each side of the head that aids in chewing by elevating the mandible (lower jaw).

Extensor Digitorum Longus

A muscle in the lower leg that helps to extend the toes and dorsiflex the foot.