What Has Research on Twins Revealed Concerning a Possible Genetic

question 56

Multiple Choice

What has research on twins revealed concerning a possible genetic etiology for autistic disorder?

• A) High MZ concordance rates suggest a strong role for genetic factors.
• B) Similar concordance rates for MZ and DZ twins point to a significant role for the environment.
• C) Concordance rates have been low and inconsistent, suggesting little, if any, role for genetic factors.
• D) Analysis of the concordance rates suggest that a predisposition to dementia is the primary etiological factor.

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Definitions:

Bulb Syringe

A small, rubbery tool used to gently suction mucus or fluids from a baby's nose, ear, or throat.

Tooth Decay

The destruction of tooth enamel, leading to cavities, infection, and potentially tooth loss, caused by bacterial action.

Ear Infections

Infections of the ear, which can affect the outer, middle, or inner parts, often leading to pain, swelling, and sometimes hearing loss.

Dysphagia

Difficulty in swallowing, a condition that may result from disorders affecting any part of the swallowing process.