The only way a recessive trait such as red hair can be expressed in the phenotype is if a person has

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The expression of a recessive trait like red hair requires two copies of the recessive gene. This means that a person must inherit two recessive genes; one from each parent, in order to have red hair. If a person only has one recessive gene and one dominant gene, the dominant gene will be expressed in the phenotype instead. Sex-linked inheritance and having two red-haired parents may increase the likelihood of having red hair, but they are not necessary for the expression of the trait.

The Only Way a Recessive Trait Such as Red Hair