Mendel's principles of genetics (use updated terminology)
1. The traits of an organism are determined by its genes.
2. Each organism has two alleles that make up the genotype for a given trait.
3. In sexual reproduction, each parent contributes ONLY ONE of its alleles to its offspring.
4. In each genotype, there is a dominant allele. If it exists in an organism, the phenotype is determined by that allele.