Allele - Version of a gene., Dominant - An genetic trait that is always expressed in the phenotype when present, Recessive - A genetic trait that lacks the ability to express itself when a dominant gene is present., Chromosome - Tightly wound bundle of DNA. , Gene - Segment of DNA that codes for a trait., Genotype - The 2 letter code for the gene. , Phenotype - Observable physical trait. Genetic trait you see., Heterozygous - Two different alleles for a trait. (M and m) or (m and M), Homozygous - Both alleles are identical for a trait. (M and M) or (m and m),

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