In guinea pig, black short hair (BBSS) is dominant over white long hair (bbss). In the dibybrid cross, $F_{2}$ genotype BBSS, BbSS, BBSs and BbSs appear in the ratio of

9 : 3 : 3 : 1

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4 : 2 : 1 : 2

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1 : 2 : 1 : 4

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1 : 2 : 2 : 4

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Solution

The correct option is D 1 : 2 : 2 : 4

A black short hair guinea pig(BBSS) is crossed with long white hair guinea pig(bbss). In the F1 generation, black short guinea pigs(BbSs), are formed. When these F1 hybrids are interbred, in the F2 generation, 9 black short guinea pigsm 3 black long guinea pigs, 3 white black guinea pigs, 1 white long guinea pigs are formed phenotypically. Genotypicallu 1BBSS, 2BBSs, 2BbSS, 4BbSs, 1BBss, 2Bbss, 1bbSS, 2bbSs, 1bbss are formed
So, the correct option is ‘1:2:2:4’.

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In guinea pig, black short hair (BBSS) is dominant over white long hair (bbss). In the dibybrid cross, F2 genotype BBSS, BbSS, BBSs and BbSs appear in the ratio of

In guinea pig, black short hair (BBSS) is dominant over white long hair (bbss). In the dibybrid cross, $F_{2}$ genotype BBSS, BbSS, BBSs and BbSs appear in the ratio of