Discussion
The normal distribution for a trait existing in a large population reveals that
Answer: D
A normal distribution shows that most individuals lie near the average and few at the extremes, so the answer is Both (B) and (C).
In the bell-shaped curve for a continuous trait, the largest number of individuals is close to the mean, and the number falls off steadily towards each extreme, so fewer individuals have the extreme genotype.
Option A, that all individuals are homozygous for the trait, is wrong, because a normal distribution of a polygenic trait comes from variation in genotypes.
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