genotype - RR Rr rr, phenotype - physical characteristic , heredity - passing of traits from parents to offspring, adenine - Nitrogenous base that pairs with thymine, guanine - Nitrogenous base that pairs with cytosine, dominant trait - the trait that will show itself if present, recessive trait - trait that is masked or hidden in a genotype, mutation - a change in the DNA order, deletion - type of change when a step is left out, genes - these CARRY hereditary instructions,

Genetics !

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