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◉ Science·1 min·Updated Mar 11, 2026

What is Allele?

Allele

Quick Answer

An allele is a variant form of a gene that can produce different traits in an organism. For example, a gene for flower color can have one allele for red flowers and another for white flowers.

Overview

In biology, alleles are different versions of the same gene that can be found at the same location on a chromosome. Each individual inherits two alleles for each gene, one from each parent. These alleles can be dominant or recessive, influencing how traits are expressed in an organism. When a gene has multiple alleles, the combination of these can lead to various physical traits. For instance, in humans, the gene that determines blood type has three different alleles: A, B, and O. Depending on the combination of alleles inherited from parents, a person can have blood type A, B, AB, or O, showcasing how alleles contribute to genetic diversity. Understanding alleles is crucial in fields like genetics and medicine because they play a significant role in inheritance patterns and can affect an individual's health. For example, certain alleles are linked to genetic disorders, and knowing about them can help in predicting health risks and making informed decisions about medical care.

Frequently Asked Questions

Dominant alleles are those that can mask the effect of recessive alleles when both are present. This means that if an individual has one dominant and one recessive allele, the dominant trait will be expressed.
While individuals can only inherit two alleles for each gene (one from each parent), a gene can have multiple alleles in a population. This means that different individuals can carry different alleles for the same gene.
Alleles influence the physical characteristics or traits of an organism by determining how genes are expressed. Different combinations of alleles can lead to variations in traits, such as color, size, or behavior.