Genetic studies suggest that intelligence is based on ____ of the variation in crystallized intelligence.
A) many genes that account for almost all
B) a single gene that accounts for about half
C) a single gene that accounts for almost all
D) many genes that account for about half

Question

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Genetic studies suggest that intelligence is based on many genes that account for about half of the variation in crystallized intelligence. This means that there is no single gene responsible for intelligence, but rather multiple genes that contribute to it. Studies have also shown that environmental factors play a significant role in shaping intelligence, further highlighting the complexity of this trait.

Genetic Studies Suggest That Intelligence Is Based on ____ of the Variation