To understand what is allele it is essential to study genetics and understand how the transfer of characters between generations works.
You allelesare forms of expression of the same gene, which occupy the same position in the chromosome, called a gene locus or locus.
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Alleles recombine during zygote formation. Different alleles can result in expressions phenotypic different, such as the pigmentation of hair, eyes and skin.
However, most of these allele variations result in minimal differences, which cannot always be observed.
Homologous chromosomes are those that have genes that determine the same characteristic, therefore, they occupy the same locus.
In diploid individuals, chromosomes are formed by alleles from both parents. Thus, one parent may have donated the A allele and the other the a allele, both for eye color determination. And, despite being part of the same locus, they can determine different colors.
Alleles are always represented by letters, capital letters represent dominant alleles and lowercase letters represent recessive alleles.
When an allele is dominant, it can be expressed even at single doses (Aa). Recessive alleles are only expressed if they are in pairs (aa).
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