Notes on Mendelian genetics and some inheritance rules. Mendel discovered that there were 2 alleles of each gene that he studied, and every gene that he had studied was on a separate chromosome. We’ll investigate why this is important later.

> Mendel’s Laws: the law of segregation and the law of independent assortment

> Punnett square: a useful tool for figuring out crosses

> The testcross: a useful tool for identifying unknown genotypes based on offspring phenotypes with a homozygous recessive individual

> Other inheritance patterns: incomplete dominance, codominance, multiple alleles, pleiotropy, epistasis, and polygenic inheritance