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 chromosomes; controls an organism's phenotype., Homozygous, A genotype in which the two alleles of a gene are the same., Heterozygous, A genotype in which the allele 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., Pedigree, A tool that shows phenotypes of genetically related family members.

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