Use the Following to Answer Questions

question 6

Multiple Choice

Use the following to answer questions
Scenario II
For centuries,people have made the observation that intelligence seems to run in families.In modern times,psychologists have confirmed that,indeed,there is a strong genetic component to intelligence.The degree of the association between genes and intelligence can be quantified using the heritability coefficient (h²) .In a population of diverse individuals differing in age,gender,race,and socioeconomic factors,the heritability of intelligence is approximately .5 to .7.This means that about 50-70% of the variability in intelligence scores is associated with genetic factors.Interestingly,the heritability coefficient changes depending on the group under investigation.For example,among wealthy children,the heritability coefficient exceeds .7 because the environments of these children are highly homogeneous.Among poor children,it drops to about .1.The heritability coefficient also tends to increase with the age of the population under investigation.For example,the heritability coefficient is approximately .3 in 3-year-olds and approximately .9 in 65-year-olds.
-(Scenario II) In the late 1800s,Sir Francis Galton analyzed data based on several thousand English families and confirmed the long-standing observation that intelligence runs in families.Nevertheless,this study alone does not constitute good evidence that genes are associated with intelligence primarily because:

• A)relatives tend to share similar environments.
• B)parents with below-average intelligence sometimes produced highly intelligent offspring.
• C)the sample size was limited and restrictive to only English families.
• D)the drift that occurs in intelligence with age was not controlled.

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