A Small Difference Between the Concordance Rates Seen in Fraternal

question 10

Multiple Choice

A small difference between the concordance rates seen in fraternal and identical suggests that:

• A)variation due to genotype is far more important than variation due to environment.
• B)variation due to genotype is far less important than variation due to environment.
• C)variation due to genotype is about equally as important as that due to environment.
• D)the trait is probably due to a single gene that shows Mendelian inheritance patterns.
• E)the genes affecting the trait interact strongly with the environment.

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Definitions:

Tongue

A muscular organ in the mouth of most vertebrates that manipulates food for mastication and is used in the act of swallowing.

Palate

The roof of the mouth in humans and vertebrates, separating the oral cavity from the nasal cavity and consisting of the hard and soft palate.

Pharynx

A muscular tube that connects the mouth and nasal cavity to the esophagus and larynx, part of both the digestive and respiratory systems.

Chondroglossus

A muscle in the tongue that is responsible for tongue movements and shaping during speech and swallowing.