A 9:3:3:1 phenotypic ratio is expected from a dihybrid cross between a double heterozygote and a fully recessive organism.

Name: A 9:3:3:1 phenotypic ratio is expected from a dihybrid cross between a double heterozygote and a fully recessive organism.
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A 9:3:3:1 phenotypic ratio is expected from a dihybrid cross between two heterozygous organisms, not between a double heterozygote and a fully recessive organism, which would result in a 1:1:1:1 ratio.

A 9:3:3:1 Phenotypic Ratio Is Expected from a Dihybrid Cross