Gene - a section of DNA on a chromosome that has genetic information for one trait. , Allele - a different form of a gene., Phenotype - how a trait appears or is expressed., Genotype - The alleles of all the genes on an organism's chromosome; controls an organism's phenotype., Homozygous - a genotype in which two alleles of a gene are the same., Heterozygous - a genotype in which 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., Genetics - the study of how traits are passed from parents to offspring., Heredity - the passing of traits 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., Pedigree - a tool that shows phenotypes of genetically related family members,

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