The heritability of adult intelligence as measured by IQ tests is usually reported to be about .75, which means that ____.
a. 75 of an individuals intelligence is due to his or her genes
b. 75 of an individuals genes are involved in intelligence
c. 75 of a populations genes, on average, are involved in intelligence in individual members of the population
d. 75 of the variance in intelligence observed in the population can be attributed to genetics
Question 2
Children with average IQ scores showed a peak thickening of cortical gray matter around the age of 8, while children with superior IQ scores experienced a peak thickening at around ____.
a. age 5
b. age 10
c. age 13
d. age 15
