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Biological explanations for anorexia nervosa

Biological explanations for anorexia nervosa

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Question 1

A psychologist investigated the genetic basis of Anorexia Nervosa by comparing concordance rates across three groups of siblings reared together. The results are shown in Table 1 below.

Table 1: Concordance rates for Anorexia Nervosa in different sibling relationships

Sibling RelationshipShared DNAConcordance Rate
Monozygotic (MZ) Twins100%56%
Dizygotic (DZ) Twins50%7%
Adoptive Siblings0%2%

With reference to the data in Table 1, explain what can be concluded about the genetic basis of Anorexia Nervosa. Justify your answer.

[2]
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Biological explanations for anorexia nervosa Questions

  1. A Level
  2. /Psychology
  3. /Biological explanations for anorexia nervosa

6 exam-style questions on AQA A Level Psychology Biological explanations for anorexia nervosa. Each one has a worked solution and a mark scheme showing where the marks go.

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