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Biological approach

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Question 16

In a psychiatric genetics study, researchers investigated 150 pairs of monozygotic (identical) twins to determine the concordance of Major Depressive Disorder (MDD). The researchers recorded whether both twins in a pair shared the same clinical diagnosis (either both diagnosed with MDD, or both free of MDD) or had different diagnoses (one twin diagnosed with MDD and the other free of MDD).

Table 1: Concordance of Major Depressive Disorder (MDD) diagnoses in 150 monozygotic twin pairs

Twin pairs sharing the same MDD diagnosisTwin pairs with different MDD diagnoses
5793

Use your knowledge of genotype and phenotype to explain the data in Table 1.

[4]

Biological approach Questions

  1. A Level
  2. /Psychology
  3. /Biological approach

Practise AQA A Level Psychology Biological approach with exam-style questions for A Level Psychology. 48 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