The gene that codes for the number of fingers on the human hand has two alleles-five fingers and six fingers. The letters F and f are used to represent this trait. Having five fingers is the recessive trait. If a person has six fingers, her genotype is _____.

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Since having five fingers is the recessive trait (represented by ff), having six fingers means the individual must have at least one dominant allele (F). Therefore, the genotype could be either heterozygous (Ff) or homozygous dominant (FF) to express the six-finger trait.

The Gene That Codes for the Number of Fingers on the Human