Imagine you hear a report about a heritability study that claims trait X is "50% genetic." Which of the following is a more accurate way of stating this?
a. Fifty percent of individual difference of trait X within a population are due to genetic factors.
b. Only half of a population has the trait.
c. The trait is homozygous.
d. More than 50% of similarities of trait X within a population are the result of genetic factors.
Answer: A
Rationale: A heritability of 0 means that genes do not contribute to individual differences in a trait, whereas heritability of 1.0 indicates that genes account for all individual differences in a trait.
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