Which of the following statements about heredity and intelligence is true? (2 points) a similarities in intelligence between identical twins who were separated at birth and raised in different houses must be due to heredity. b differences in intelligence between identical twins who were separated at birth and raised in different houses must be due to heredity. c differences in intelligence between identical twins must be due to differences in their environments. d if identical twins are separated at birth and raised in different homes, yet still have similar intelligence scores, the similarity in their scores must be due to hereditary influences. e prenatal influences have little, if any, influence on intelligence and need not be taken into account when studying environmental influences.

The correct answers are:

C. Differences in intelligence between identical twins must be due to differences in their environments.

D. If identical twins are separated at birth and raised in different homes, yet still have similar intelligence scores, the similarity in their scores are most likely due to hereditary influences.

Since identical twins have the same genetic material, the only difference between them can be their environment, not heredity. Therefore the environment affects their intelligence levels differently and hereditary influences affect the similarity in their intelligence levels.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.