dihybrid cross


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dihybrid cross

the mating of two individuals, organisms, or strains that have different gene pairs that determine two specific traits or that have two particular characteristics or gene loci being followed.
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At this point, the dihybrid cross is essentially identical to a sample monohybrid cross, except with two traits.
As complicated as this dihybrid cross was, imagine such a cross with characters displaying incomplete dominance or a trihybrid cross (three nonlinked traits).
Two linked traits will not produce the typical 9:3:3:1 ratio in the F2 generation of a dihybrid cross (as previously discussed) because the genes are not subject to independent assortment during meiosis.
The 351:256 results more closely resemble a 9:7 ratio, which would indicate a modified 9:3:3:1 ratio of a dihybrid cross, indicating two pairs of genes.