Her brown eyes in this case were caused by a dominant allele.
What are dominant alleles, exactly?
- When more than one allele is present, a dominant allele is a gene variant that will still cause a particular phenotype.
- A dominant allele typically codes for a functional protein.
- The allele is dominant because it produces enough enzyme from a single copy to allow a cell to have an abundance of a certain product.
Why are some genes dominant alleles?
- A dominant allele is referred to as dominant because it conceals the recessive trait and appears in the phenotype of a heterozygous species.
- One allele is all that is required to express the trait.
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