Guniea pig having black colour when crossed with guinea pig having same colour produced 80 offsprings, out of which 60 were black and 20 were whie. Now, find out
a] What is the possible genotype of the guinea pigs?
b] Which traits is dominant and which traits is recessive?
c] What is this cross called as and what is its phenotypic ratio?

Explanation

a] `Bb xx Bb`
b] Black is dominant and white is recessive,
c] Monohybrid cross, phenotypic ratio=3:1