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One phenotype is never true breeding and when crossed yields a 2:1 ratio is a signature for......

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Final answer:

Incomplete dominance is a genetic phenomenon that results in an intermediate phenotype. When crossed with another phenotype of the same kind, the ratio of offspring phenotypes is 2:1.

Step-by-step explanation:

Incomplete dominance is a genetic phenomenon where two contrasting alleles do not display dominance or recessiveness, but instead produce an intermediate phenotype. When a phenotype showing incomplete dominance is crossed with another phenotype of the same kind, the resulting offspring will show a 2:1 ratio of phenotypes, with two offspring displaying the intermediate phenotype and one offspring displaying either of the parent phenotypes.

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