Numerous Twin Studies Have Confirmed a Genetic Component to Autistic

question 6

Multiple Choice

Numerous twin studies have confirmed a genetic component to autistic spectrum disorder.In studies comparing concordance rates in MZ and DZ twins,Folstein & Rutter (1977) found concordance in 4 out of 11 MZ twins but none in DZ twins.Subsequent twin studies have found concordance rates of between what percentages for MZ twins?

• A)40-64%
• B)15-23%
• C)70-90%
• D)60-91%

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Definitions:

Dendrite

A branched projection of a neuron that receives signals from other neurons.

Glial Cell

Non-neuronal cells in the central nervous system and peripheral nervous system that support and maintain neurons.

Organ System

A group of organs in a living organism that work together to perform a specific function or set of functions.

Nervous System

A complex network of nerve cells and fibers that transmits nerve impulses between parts of the body, facilitating response to stimuli.