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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]

Biological explanations for anorexia nervosa Questions

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

Practise AQA A Level Psychology Biological explanations for anorexia nervosa with exam-style questions for A Level Psychology. 6 questions, matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank