Evidence or proof that a trait is caused by a single gene includes

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Observing Mendelian inheritance patterns is the best evidence or proof that a trait is caused by a single gene. This is because Mendelian inheritance follows predictable patterns of inheritance based on the dominant and recessive nature of genes. If a trait follows a Mendelian pattern of inheritance, it suggests that only one gene is responsible for the expression of that trait.

Evidence or Proof That a Trait Is Caused by a Single