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Give a cross of co-dominance using a suitable example.

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Coat colour in cattle

Red female RR × White male WW 

P1 generation : RR × WW 

Gametes : R and W 

F1 generation all RW Roan coloured 

P2 generation RW × RW

R W
R RR RW
W RW WW

Genotypic ratio : 1 RR : 2 RW : 1 WW 

Phenotypic ratio : 1 Red : 2 Roan : 1 White

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