In order to exhibit a recessive phenotype, an individual must be homozygous for the recessive allele.

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Different versions of a gene are called alleles. Alleles can sometimes be classified as dominant or recessive.

Allele

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

A dominant allele always results in the dominant phenotype.

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