How might a behavioral geneticist explain the statistically significant finding that television watching is heritable?

Question

BlackTom AI · Accepted Answer

Heritable variation in a behavior typically means genetic differences influence traits that make some people more likely to engage in that behavior, not that there is a single “TV-watching gene.”

1) Relevant knowledge points and concepts:
- Heritability: the proportion of variance in a trait in a population attributable to genetic differences, estimated via twin/adoption studies.
- Pleiotropy: single genes or gene networks can affect multiple phenotypes (e.g., temperament and activity level).
- Gene–environment correlation (passive, evocative, active): genetic tendencies influence the environments people experience or select.
- Behavioral predispositions (e.g., sensation seeking, energy level) can mediate between genotype and specific behaviors.

2) Step-by-step reasoning:
- Twin/adoption studies may show that similarity in TV-watching is greater for genetically related individuals, giving a statistically significant heritability estimate.
- That estimate does not identify a causal “TV gene”; instead it indicates genetic influence on one or more traits that are causally upstream of TV watching.
- For example, an inherited tendency toward low energy or lethargy makes sedentary activities (like watching TV) more appealing. Conversely, inherited sensation-seeking could bias individuals toward types of media consumption that match that trait.
- Through active gene–environment correlation, someone with a genetic predisposition for sedentary leisure will choose environments and habits (more TV time) that fit that predisposition, producing the heritable pattern observed.

3) Intermediate logic steps (no numeric calculation here):
- Observed: genetic relatedness correlates with TV-watching similarity.
- Interpretation: genes → intermediate traits (e.g., temperament) → behavior (TV time).
- Therefore: heritability arises via related heritable propensities.

4) Why the correct answer is correct:
- Option stating “related heritable propensities, such as sensation seeking or lethargy, might lead one to watch TV more often” captures pleiotropy and gene–environment correlation mechanisms that explain how genes influence a complex, socially mediated behavior like TV watching.

5) Why other options are incorrect:
- “There is an active gene that causes individuals to watch TV” is a genetic determinism error; complex behaviors are polygenic and mediated by traits, not single-gene causes.
- “Individuals form TV habits if they grow up with parents who often watch TV” describes environmental transmission; it can coexist with genetic effects but does not explain a heritability estimate.
- “Parents encourage TV because it secures reproductive success” is speculative evolutionary storytelling without empirical support and does not explain observed genetic correlations.

Conclusion: The best explanation is that related heritable propensities (e.g., sensation seeking or lethargy) influence TV watching, which matches the provided correct answer.

How might a behavioral geneticist explain the statistically significant finding that television watching is heritable?单项选择题

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