Guinea pig having black colour when crossed with guinea pig having same colour produced 80 offspring out of which 60 were black and 20 were white

CBSE Class 10 CBSE Class 10 Science
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1

Guinea pig having black colour when crossed with guinea pig having same colour produced 80 offspring out of which 60 were black and 20 were white. Now, find out:
(i) What is the possible genotype of the guinea Pig?
(ii) Which trait is dominant and which trait is recessive ?
(iii) What is this cross called as and what is its phenotypic ratio ?

2

(i) Bb x Bb
(ii) Black is dominant while white is recessive.
(iii) Monohybrid cross
Phenotypic ratio is = 3 :1