In his famous experiments on pea plants, Gregor Mendel rejected this hereditary mechanism in favor of particulate inheritance by demonstrating that alternative versions of genes (alleles ...

Because of natural selection, different alleles are more likely to confer a survival advantage in different environments. Cycles of infectious disease prevalence and virulence often reflect ...

calculations are: two out of four possible combinations create 50% chance for AA, and 50% chance for Aa alleles. There are three different offspring combinations. One is EE (homozygous dominant ...

A gene is a small section of DNA that codes for a characteristic (e.g. eye colour). Alleles are different forms of the same gene, for example blue and brown are both alleles of the eye colour gene.