On the scale used by behavior geneticists to quantify the relative impact of genes versus environment, the closer the score to 1.0, the less variance there is for that trait in the population.

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The closer the score is to 1.0, the greater the impact of genes and the less impact of the environment on the trait. Therefore, there would be more variance in the population. A score of 0 indicates that the environment is the sole factor influencing the trait, and a score of 1 indicates that genes are the sole factor.

On the Scale Used by Behavior Geneticists to Quantify the Relative