The phenotypes of a trait controlled by the same gene are not always identical.

Question

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The expression of a gene can be influenced by various factors such as environmental conditions, presence of other genes, mutations, etc., which can result in differences in the phenotype even though the gene is the same. This is known as gene expression variability. Therefore, phenotypes of a trait controlled by the same gene can vary among individuals.

The Phenotypes of a Trait Controlled by the Same Gene