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(C) This is a classic example of a test cross.Let the dominant allele for black colour be $X$ and the recessive allele for white colour be $x$.The gen

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$1:1$

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(C) This is a classic example of a test cross.Let the dominant allele for black colour be $X$ and the recessive allele for white colour be $x$.The genotype of the heterozygous black dog is $Xx$.The genotype of the recessive homozygous white bitch is $xx$.When these are crossed $(Xx 	imes xx)$,the gametes produced are $X, x$ from the dog and $x$ from the bitch.The resulting offspring genotypes are $Xx$ (black) and $xx$ (white) in a ratio of $1:1$.

$A$ black dog heterozygous for the colour is crossed with a white bitch,which is recessive homozygous. The progeny will show black to white offspring in the ratio of:

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