Which of the following is the strongest support for a genetic influence on autism?
a. The concordance rate for autism is 70 percent in fraternal twins and 0 percent in identical twins.
b. The concordance rate for autism is 5 percent in fraternal twins and 70 percent in identical twins.
c. Siblings of autistic children are less likely to develop autism than the normal population.
d. Parents of autistic children are usually autistic.
e. Autism is effectively treated using serotonin agonist drugs.
Question 2
A general finding is that the brains of autistic children exhibit
a. loss of cells within the cerebral cortex.
b. enlarged brain size.
c. fewer axons within the corpus callosum.
d. reduced volume of the hippocampus.
e. decreased numbers of gyri within the frontal lobes.
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