Which of the following statements regarding the heritability of depression is true?
I) Depression appears to be heritable in human populations.
II) Gene TAS2R38 has been identified as impacting serotonin production and is responsible for the heritability of depression.
III) More severe cases of depression seem to be more heritable

• A. I & II.
• B. II & III.
• C. I & III.
• D. I, II, & III.

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the concept of heritability in psychology. Heritability refers to the proportion of variation in a trait (such as depression) within a population that can be attributed to genetic factors. It does not mean that a trait is entirely determined by genes, as environmental factors also play a role.
2. Step 2: Analyze statement I: 'Depression appears to be heritable in human populations.' Research in psychology and genetics supports this statement, as studies (e.g., twin studies) have shown that depression has a genetic component, making this statement true.
3. Step 3: Analyze statement II: 'Gene TAS2R38 has been identified as impacting serotonin production and is responsible for the heritability of depression.' This statement is false because TAS2R38 is a gene associated with taste perception, not serotonin production or depression. Genes related to serotonin, such as 5-HTTLPR, are more relevant to depression.
4. Step 4: Analyze statement III: 'More severe cases of depression seem to be more heritable.' This statement is true, as research indicates that the heritability of depression tends to increase with the severity of the condition. Severe cases are more likely to have a stronger genetic component.
5. Step 5: Based on the analysis, the correct answer is 'I & III,' as these are the statements supported by psychological and genetic research. Statement II is incorrect and should be excluded.