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Define trihybrid cross. Mention its F2 p...

Define trihybrid cross. Mention its `F_2` phenotypic ratio.

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A cross between homozygous parents that differ in three gene pairs (i.e producing trihybrids ) is called trihybrid cross.
`F_2` Phenotypic ratio `-27 : 9 : 9 : 9 : 3 : 3 : 3 :1`
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