Genetics - the study of how traits are inherited, Trait - a characteristic of living things , Dominant - A version of a gene that is always expressed, Recessive - the version of a gene that is only expressed if there are two presentt, genes - Sections of DNA, contains a code for a protein or trait, Alleles - different versions of a gene e.g. T or t, Genotype - the 2 alleles (two letters) present for a trait , Phenotype - trait observed determined by the genotype (e.g. eye color, hair color), pure breed - TT or tt. Alleles are the same. Also called homozygous, hybrid - Tt. One of each allele. Also called heterozygous, punnett square - Shows the possible combinations of offspring from two parents,

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