This document discusses heredity and genetics, including definitions of DNA and genetics. It addresses homozygotes versus heterozygotes, dominant and recessive traits, parental and filial generations as well as gametes, genotypes and phenotypes. An example is given of a donkey mating with a horse to produce a mule. Dominant, semi-dominant and recessive traits are explored, with semi-dominant traits having intermediate expression. The document recommends further reading on genetics via the provided Wikipedia link.