Practice question · Select all that apply
Select every statement that is TRUE about behavioral genetics.
Hints
- Only one option is false; find the individual-level misreading.
- Heritability is about population variance, not one person's trait.
Show the answer
- A. Heritability is a population-level statistic about variance.
- B. Fraternal twins share about 50% of their genes, like ordinary siblings.
- C. The genetic contribution to IQ appears to strengthen from childhood into adulthood.
- D. Identical twins share about 100% of their genes.
Why
Identical twins' ~100% and fraternal twins' ~50% gene sharing, the rising heritability with age, and heritability as a population statistic are all true. Heritability does NOT mean 70% of an individual's trait is genetic - the one false option.
Practise Nature vs. Nurture
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