Genetic Influence on IQ Scores in Twins

What is the mean correlation between IQ scores of identical twins as per Bouchard and McGue (1981)?

+.86 (correct)

+.60

+.72

+.50

Which type of twins share about 50 per cent of their genetic makeup?

Fraternal twins (correct)

Identical twins

Step-siblings

Half-siblings

What is the mean correlation between IQ scores of fraternal twins raised in the same home?

+.72

+.60 (correct)

+.50

+.86

If heredity influences intelligence, which type of twins would be expected to have more similar IQ scores?

Identical twins Signup and view all the answers

What is the impact of upbringing on the IQ scores of identical twins raised in different homes?

+.72 correlation Signup and view all the answers

Based on the information provided, which type of twins are more likely to have similar IQ scores?

Identical twins raised together Signup and view all the answers

What is the mean IQ correlation for identical twins raised in different homes?

.72 Signup and view all the answers

According to the passage, what does a mean correlation of .86 indicate for identical twins raised in the same home?

Identical twins raised in the same home have very similar IQs. Signup and view all the answers

In the adoption study by Scarr & Weinberg, what was the average IQ of children who remained with their biological parents?

90 Signup and view all the answers

What was the IQ average of adopted children in the study by Scarr & Weinberg?

105 Signup and view all the answers

According to the passage, what do adoption studies indicate about intelligence?

Intelligence is not determined entirely by heredity. Signup and view all the answers

What was the mean correlation for twins raised in the same home?

.86 Signup and view all the answers

What is the correlation in IQ scores for identical twins raised separately?

+.72 Signup and view all the answers

Compared to fraternal twins reared together, which group tends to have a higher IQ score correlation?

Identical twins raised separately Signup and view all the answers

What is the mean correlation in IQ scores for siblings reared apart?

+.24 Signup and view all the answers

According to Bouchard and McGue (1981), what is the mean correlation in IQ scores for parent and child living together?

+.42 Signup and view all the answers

What does a higher correlation between biological relatives' IQ scores suggest?

Greater influence of heredity Signup and view all the answers

In adoption studies, what is compared in relation to the intelligence of adopted children?

Biological parents and adopted parents Signup and view all the answers