Which one of the following sets of data would show a strong genetic influence on the development of a trait?
a. Identical twins raised together score more similarly to one another than identical twins raised apart.
b. Fraternal twins raised apart score as similarly to one another as do biological siblings who are raised together.
c. Identical twins raised apart score more similarly to one another than fraternal twins raised together.
d. Fraternal twins raised together score more similarly to one another than fraternal twins raised apart.
Question 2
Plomin bred animals with high learning ability to other animals with high learning ability and animals with low learning ability to other animals with low learning ability. Those from high learning ability lines continued to show high learning ability while those from low learning lines continued to show low learning ability. In Plomin's work, learning ability
a. varied by the age of the animal.
b. was a totally learned behavior.
c. varied by the sex of the animal.
d. was influenced by genetics.
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