An allele is a variation of a portion of DNA that codes for a specific trait, for example, the type of hair, or the type of blood. It's a version of a gene, as we can see in the third answer option. They can be dominant or recessive, being represented with a capital letter, or with a lowercase letter, for example A, or a (dominant and recessive respectively). We can see it too as the respective genetic load we inherit from each parent: we inherit from them 23 pairs of chromosomes, or 46 of them, having each part a