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Mendel's Monohybrid Experiments

Black coloure...

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 $F_{2}$ generation with the help of a checker board.

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Solution

When the black coloured guinea pig (BB) is crossed with white coloured guinea pig (bb):
Parents: BB x bb
Gametes: B, B x b, b
F $_{1}$ generation: All Bb (black coloured guinea pig)
Selfing: Bb x Bb
Gametes: b, b x B, b
F $_{2}$ generation: BB, Bb, Bb and bb
The offsprings produced in the F $_{2}$ generation are:
BB- black coloured guinea pig
2 Bb- black coloured guinea pig
bb- white coloured guinea pig
The genotypic ratio is 1:2:1. (1 BB, 2Bb and 1 bb)
The phenotypic ratio is 3:1 (3 black and 1 white)

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