Question

Black coloured guinea pig (BB) is crossed with white coloured guinea pig (bb). Find out the ratio of the types of the offsprings produced in the F2 generation with the help of a checkerboard.

Answer 1

Hint:- The guinea pig or domestic guinea pig which is also known as cavy or domestic cavy.
A species of rodent belonging to the family Caviidae and the genus Cavia is called the guinea pig.
Contempt to their common name, the guinea pigs are not innate to Guinea. Also, they are not
closely and biologically associated with the species of the pigs. Thus, we can say that the origin of
Their names are still unclear.

Complete step-by-step solution:-
In a case where the black colored guinea pig (BB) is crossed with a white-colored guinea pig (bb):
The genotype of parents is BB x bb
The Gametes of parents are B, B x b, b
The phenotype of F1​ generation: All are Bb (that is black colored guinea pig)
The Selfing of F1​ generation is Bb x Bb
The gametes F1​ generation are b, b x B, b
The phenotype of F2​ generation: BB, Bb, Bb, and bb
The offsprings produced in the F2​ generation are:
- BB- black colored guinea pig
- 2 Bb- black colored guinea pig
- bb- white-colored guinea pig
In such types of cases, the black is dominant and the white is recessive.
The ratio of genotypic is 1:2:1. (1 BB, 2Bb, and 1 bb)
The ratio of phenotypic is 3:1 (3 black and 1 white)

Note:- It is a fact that these guinea pigs were actually originally tamed as livestock, for a source of meat. However, they remained to be consumed as food as of today. In the society of Western society, the guinea pig has enjoyed widespread popularity as a pocket pet. It was introduced by European traders to Europe and North America in the 16th century.