Heredity, when traits are passed down or inherited from parents to offspring, Genetics, the study of how traits are passed from parent to offspring, Dominant trait, the trait that uses uppercase letters for the genotype, Recessive trait, the trait that uses lowercase letters for the genotype, Gene , a section of DNA on a chromosome that has genetic information for one trait, Allele , a different form of gene , Genotype, The letters that control an organisms phenotype, Phenotype, the traits you can see, Homozygous, A genotype in which both letters or alleles are the same, Heterozygous, a genotype in which the two letters or alleles are different, Punnett Square, a model used to predict the different phenotypes and genotypes of an organism, Pedigree, tool used to show the phenotype of a family (the chart with the circles and the squares) .

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