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Approaches in Psychology

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Question 74

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]
Markscheme

Approaches in Psychology Questions

  1. A Level
  2. /Psychology
  3. /Approaches in Psychology

248 exam-style questions on AQA A Level Psychology Approaches in Psychology, covering Learning approaches, Cognitive approach, Biological approach, Psychodynamic approach (A-level only), Humanistic Psychology (A-level only), and Comparison of approaches (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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