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[" In polygenic inheritance,a trait is c...

[" In polygenic inheritance,a trait is controlled by two pairs of genes.Two individuals which are heterozygous "],[" both genes,crossed each other,such type of cross produces what phenotypic ratio? "],[[" (1) "1:2:1," (2) "9:3:3:1],[" (3) "1:4:6:4:1," (4) "1:6:15:20:15:6:1]]

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