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A dihybrid cross is a breeding experiment between two organisms which are identical hybrids for two traits. In other words, a dihybrid cross is a cross between two organisms, with both being heterozygous for two different traits. The individuals in this type of trait are homozygous for a specific trait.
In a dihybrid cross, we equate two related features. Its phenotypic relationship is 9:3:3:1, where 9 plants possess all dominant features, and 1 plant possesses all recessive features. Related sexually breeding species (valid only for Angiosperms).
A 9:3:3:1 Ratio is at ratio of phenotypes among offspring (progeny) that results when two dihybrids mate, e.g., AaBa AaBa, where allele A is dominant to allele a, allele B is dominant to allele b, and the A and B loci otherwise have no impact on each other phenotypically (no epistasis) nor genotypically (no linkage).
This 9:3:3:1 phenotypic ratio is the classic Mendelian ratio for a dihybrid cross in which the alleles of two different genes assort independently into gametes. Figure 1: A classic Mendelian example of independent assortment: the 9:3:3:1 phenotypic ratio associated with a dihybrid cross (BbEe BbEe).
Dominant allele for purple corn kernels = P Recessive allele for yellow corn kernels = p Dominant allele for starchy kernels = S Recessive allele for sweet kernels = s Cross a plant that is homozygous recessive for both traits with a plant that is heterozygous for both traits.

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Dihybrid cross is just the name given to crossing of two identically heterozygous individuals, and it happens that it results in a 9:3:3:1 ratio. You can cross any two individuals by using a Punnet square, but they would not have the same 9:3:3:1 ratio.

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