Davenport and Davenport estimated that two genes control skin color in humans, while, according to others, as many as four different genes are involved. Why has there been so much difficulty in determining the number of genes controlling this trait?

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The Answer of Davenport and Davenport estimated that two genes control skin color in humans, while, according to others, as many as four different genes are involved. Why has there been so much difficulty in determining the number of genes controlling this trait?

Davenport and Davenport Estimated That Two Genes Control Skin Color