question: Skin color is controlled by how many genes?
choices.text: keratin alleles chromosomes classified several eight neurones pigments
choices.label: A B C D E F G H
fact2: Polygenic inheritance Polygenic traits are controlled by an unknown number of genes.
combinedfact: Skin color is controlled by an unknown number of genes.
formatted_question: Skin color is controlled by how many genes? (A) keratin (B) alleles (C) chromosomes (D) classified (E) several (F) eight (G) neurones (H) pigments