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In Guinea pigs black is dominant to white

a. If you cross two heteroxenous guineapigs what will be the genotypic and phenotypic ratios of their offspring?

b. If you cross one of the black offspring with a white guinea pig you get 12 black offspring what is the genotype of this black guinea pig?

c. If you cross another black offspring with a white Guinea pig you get 7 black offspring and 6 white offspring what is the genotype of this black Guinea pig

Sagot :

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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