Genetic Influence on IQ Scores in Twins
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Questions and Answers

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?

    <p>Identical twins</p> Signup and view all the answers

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

    <p>+.72 correlation</p> Signup and view all the answers

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

    <p>Identical twins raised together</p> Signup and view all the answers

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

    <p>.72</p> 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?

    <p>Identical twins raised in the same home have very similar IQs.</p> 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?

    <p>90</p> Signup and view all the answers

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

    <p>105</p> Signup and view all the answers

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

    <p>Intelligence is not determined entirely by heredity.</p> Signup and view all the answers

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

    <p>.86</p> Signup and view all the answers

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

    <p>+.72</p> Signup and view all the answers

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

    <p>Identical twins raised separately</p> Signup and view all the answers

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

    <p>+.24</p> 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?

    <p>+.42</p> Signup and view all the answers

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

    <p>Greater influence of heredity</p> Signup and view all the answers

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

    <p>Biological parents and adopted parents</p> Signup and view all the answers

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