This document defines key terms related to Punnett squares and genetics: 1) It defines alleles, chromosomes, codominance, dominant alleles, gametes, genes, genotype, heredity, heterozygous, homozygous dominant, homozygous recessive, incomplete dominance, genetic locus, monohybrid cross, multiple alleles, phenotype, polygenic trait, recessive, and trait. 2) Alleles are versions of genes that control the same trait, chromosomes carry genetic material, and codominance results in an intermediate phenotype. 3) Dominant alleles determine phenotype while recessive alleles are masked by dominants unless in the homozygous recessive state.