Gene - Section of DNA that codes for a trait, Sexual reproduction - Creates variation by involving two parents, Asexual reproduction - Involves only one parent, Phenotype - Physical expression of the gene, Genotype - Genetic code in the form of two symbols, DNA - The double helix molecule in the nucleus of a cell carrying the genetic code in the form of base order, Mutation - Permanent change in the base order of the DNA, Artificial selection - Features and traits chosen by humans , Natural selection - Features or traits chosen by nature that cause species to survive, Dominant gene - Gene that is always expressed if it is present in the genotype, Recessive gene - Gene which is only expressed if two copies are present in the genotype,

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