A scientist compares identical twins who were adopted into different families as babies. At age 18, the twins have similar scores on a questionnaire about s...
Question 1 Report
A scientist compares identical twins who were adopted into different families as babies. At age 18, the twins have similar scores on a questionnaire about sensation seeking, despite one growing up in a city and one on a remote farm.
(a) Outline what this finding suggests about genotype and behaviour. [2]
(b) Explain why the finding does not mean that environment has no effect. [2]
(c) Name the type of twins studied. [1]
(d) Describe one reason why adoption studies can help researchers separate genetic and environmental influences. [1]
Answer Details
(a) Identical twins share the same / very similar genotype [1]. Their similar behaviour suggests a possible genetic influence [1]. (b) They may still share prenatal influences / similar experiences [1], and behaviour may result from interaction between genes and environment [1]. (c) Monozygotic / identical twins [1] (d) Twins have shared genes but are raised in different environments, allowing environmental influence to be investigated [1].
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