heredity - The passing of physical characteristics from parents to offspring., trait - A specific characteristic that an organism can pass to its offspring through its genes., genetics - The scientific study of heredity., gene - The factors that control a trait., allele - The different forms of a gene., dominant - A trait that always shows up in an organism when the allele is present., recessive - A trait that is hidden whenever the dominant allele is present., probability - A number that describes how likely it is that an event will occur., punnett square - A chart that shows all the possible ways alleles can combine in a genetic cross., phenotype - An organism's physical appearance or visible traits., genotype - An organism's genetic makeup or alleles., homozygous - When an organism has two identical alleles for a trait., heterozygous - When an organism has two different alleles for a trait., meiosis - The process by which the number of chromosomes is reduced by half as sex cells form.,

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