Recent research has identified two genes that help determine height in humans. Individuals with the "tall" allele for both genes are taller than those with the tall allele for only one. Individuals with one tall allele, in turn, are taller than people who do not have the tall allele for either gene. This is known as:
a) pleiotropy.
b) the additive effect.
c) codominance.
d) multiple allelism.
e) the tall effect.
Ans: b) the additive effect.
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