What are Alleles?

Alleles are variations of a gene. A diploid organism gets one set of their alleles (genes) from one parent and the other set of alleles from the other parent.

Some of the traits that we have are based on simple inheritance where one version of a gene (dominant allele) masks the expression of the other version of that gene (recessive allele).

In writing, we represented dominant and recessive alleles with letters that distinguish the different types of alleles. A capital letter is used to represent the dominant allele and a lower-case letter is used to represent the recessive allele (example: dominant allele = P; recessive allele = p)

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