Research from behavioral geneticists has found that as we get older, genetic influences on intelligence are _____ in importance, shared influences are ______ in importance, and nonshared environmental influences are _____ in importance.
a. decreasing; decreasing; increasing
b. decreasing; increasing; decreasing
c. increasing; increasing; decreasing
d. increasing; decreasing; increasing
Question 2The apolipoprotein E or apoE gene is associated with an increased risk for developing
a. Down syndrome.
b. Alzheimer's disease.
c. Turner's syndrome.
d. Huntington's disease.
Question 3Molecular genetics is best described as the study of the
a. number of genes in a chromosome.
b. molecular shape of a gene.
c. first cellular division following conception.
d. impact of particular genes on particular traits.
Question 4Suppose identical twins raised apart have a correlation of .40 on a measure of some aspect of personality, and identical twins raised together have a correlation of .60 on this same measure. From these data, what can we logically conclude about this trait?
a. Nonshared environment has an impact because, even raised together, the identical twins do not show a perfect 1.00 correlation.
b. Nonshared environment has no impact because the identical twins raised apart have a lower correlation than the identical twins raised together.
c. Shared environment has no impact because identical twins raised apart have a correlation lower than 1.00.
d. Shared environment has an impact because identical twins raised apart have a correlation of .40.
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