Allele - variations of genes that determine traits in organisms; the two corresponding alleles on paired chromosoomes constitute a gene, Characteristic - special quality or appearance that makes an individual or a group different from others, Chromosome - one of the rod-shaped or threadlike structures of a cell nucleus that contain genes and divide when the cell divides, Cross - to cause (an animal or plant) to breed with one of another kind, DNA - a large organic molecule that carries genetic information in the chromosomes and resembles a twisted ladder, Dominant - a form of gene that is expressed as the trait when a dominant allele is present, Feature - a structure, characteristic, or behavior of an organism, such as eye color, plant height, or timing of migration, Filial - related to sons and daughters, Gene - a unit of DNA that is usually located on a chromosome and that controls the development of one or more traits and is the basic unit by which genetic information is passed from parent to offspring, Generation - a group of individuals born and living at about the same time, Genotype - all or part of the genetic constitution of an individual or group, Heredity - passing genetic information from parents to offspring, from one generation to the next, Heterozygous - a gene composed of a dominant and recessive allele, Inheritance - all of the genetic characters or qualities transmitted from parent to offspring, Phenotype - the traits produced by the genotype; the expression of genes, Population - all the individuals of one kind (one species) in a specified area at one time, Punnett Square - a mathematical model that predicts the probability of possible genotypes and phenotypes resulting from a genetic cross, Recessive - a form of a gene that is expressed only when a dominant allele is not present, Trait - the individual expression of a feature, Variation - is the range of difference between the traits of a feature in the individuals of a population, Homozygous - a gene composed of two identical alleles,

Variation of Traits (Definitions from Foss Diversity of Life Chapter 7 and Merriam Webster Dictionary)

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