Question
Give a cross of co$-$dominance using a suitable example.
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Answer
Coat colour in cattle
Red female $RR \times$ White male $WW$
$P_1$ generation $: RR \times WW$
Gametes : $R$ and $W$
$F_1$ generation all $RW$ Roan coloured
$P_2$ generation $RW \times RW$
Genotypic ratio $: 1 RR : 2 RW : 1 WW$
Phenotypic ratio $: 1$ Red $: 2$ Roan $: 1$ White
Red female $RR \times$ White male $WW$
$P_1$ generation $: RR \times WW$
Gametes : $R$ and $W$
$F_1$ generation all $RW$ Roan coloured
$P_2$ generation $RW \times RW$
| $R$ | $W$ | |
| $R$ | $RR$ | $RW$ |
| $W$ | $RW$ | $WW$ |
Phenotypic ratio $: 1$ Red $: 2$ Roan $: 1$ White
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