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Factor/Gene - is a unit of inheritance. It is hypothetical particle of the theory of inheritance. It is a DNA. The letter symbols A,a ; S,s ; Y,y represent genes.

Alleles - refer to the contrasting trait.
   Example: Round (R) ; wrinkled (r)
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A gene is the molecular unit of heredity of a living organism. It is used extensively by the scientific community as a name given to some stretches of deoxyribonucleic acids (DNA) and ribonucleic acids (RNA) that code for apolypeptide or for an RNA chain that has a function in the organism. An allele or allel, is one of a number of alternative forms of the same gene or same genetic locus.
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