define variation and genotypic ratio
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The genotypic ratiodescribes the number of times agenotype would appear in the offspring after a test cross. For example, a test cross between two organisms with samegenotype, Rr, for a heterozygous dominant trait will result in offspring with genotypes: RR, Rr,
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Genotype ratio:
It is the ratio of the offsprings produced in the F2 and subsequent generation with respect to their genetic make up.
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