When a trait appears in an all-or-none fashion in the phenotype, then it is known that the trait

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When a trait appears in an all-or-none fashion in the phenotype, it is mostly likely controlled by a single pair of genes, also known as a Mendelian trait. This is because the expression of the trait is either present or absent, which is determined by the presence or absence of the dominant allele in the gene pair. If the trait was controlled by a group of many pairs of genes, it would result in a more continuous variation rather than an all-or-none expression. The other options, such as learned experience and nutritional food intake, do not directly influence the genetic expression of a trait.

When a Trait Appears in an All-Or-None Fashion in the Phenotype