Gene - a section of DNA on a chromosome that has genetic information for one trait, Allele - a different from of a gene, Phenotype - how a trait appears or is expressed, Genotype - the alleles of all the genes on an organisms chromosomes that control an organisms phenotype, Homozygous - a genotype in which the two alleles of a gene are the same, Heterozygous - a genotype in which the two alleles of a gene are different, Punnett square - a model that is used to show the probability of all possible genotypes and phenotypes of offspring, Heredity - the passing of traits from parents to offspring, Genetics - the study of how traits are passed from parents to offspring, Dominant trait - a genetic factor that blocks another genetic factor, Recessive trait - a genetic factor that is blocked by the presence of a dominant factor, Pedigrees - a tool that can show phenotypes of genetically related family members,

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