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What is the key to the recognition of a trait whose expression is determined by

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What is the key to the recognition of a trait whose expression is determined by

What is the key to the recognition of a trait whose expression is determined by the effects of two or more genes (polygenic inheritance)?
A) A mating between a homozygous and a heterozygous individual produces more than the expected number of offspring expressing the dominant trait.
B) All of the alleles of the gene for that trait are equally expressed.
C) Pleiotropy occurs.
D) The trait varies along a continuum in the population.

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