In pigs, white coat (W) is dominant to black (w). Two white pigs are bred to produce nine white and three black pigs. What are the genotypes of the parents?

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In the pig, white coat is dominant over black coat, thus, the white coat will express in heterozygous condition. When the hybrid white is selfed-

$W w \times W w$

	W	w
W	WW	Ww
w	Ww	ww

The phenotypic ratio is $3 : 1$

Thus for, 9 whites and 3 blacks, the ratio is 3:1 and the genotype will be $W w \times W w$

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