Mendel's postulate of independent assortment is supported by a 1:1:1:1 testcross ratio.

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Mendel's postulate of independent assortment states that alleles of different genes assort independently of each other during gamete formation. This means that the inheritance of one gene does not influence the inheritance of another gene. The 1:1:1:1 testcross ratio, in which four different phenotypes are produced in equal proportions, supports this postulate because it indicates that the genes are indeed assorting independently.

Mendel's Postulate of Independent Assortment Is Supported by a 1:1:1:1