Alleles
Different forms of a gene
Alleles are versions of the same gene that occur at the same location (locus) on a chromosome. They can exist in different forms, resulting in different expressions or traits.
For instance, if the gene for hair color has two alleles, one for brown hair and the other for blond hair, an individual may inherit one allele from each parent, resulting in either brown or blond hair. In some cases, one allele may be dominant, meaning that it will be expressed over another recessive allele.
Alleles can also be homozygous or heterozygous. If an individual has two of the same alleles for a particular gene, they are homozygous. If they have two different alleles, they are heterozygous.
Mutations can also occur in alleles, resulting in altered expressions or traits. Genetic variations within allele sequences are responsible for differences in individual characteristics, such as the variation of skin colors, blood types, and hair types among different people.
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