Question on: JAMB Biology - 1999
If the offspring of a cross between a brown mouse (bb) and a black mouse (BB) are allowed to interbreed, how many different genotypes would result?
A
2
B
3
C
4
D
5
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Correct Option: B
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First cross: The initial cross is between a brown mouse (bb) and a black mouse (BB). All offspring (F1 generation) will have the genotype Bb (black).
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Second cross: The F1 offspring (Bb) interbreed. We need to determine the possible genotypes from this cross (Bb x Bb).
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Punnett Square: Using a Punnett square:
| | B | b | | :---- | :- | :- | | B | BB | Bb | | b | Bb | bb |
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Genotypes: From the Punnett square, the possible genotypes are BB, Bb, and bb.
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Counting Genotypes: There are three
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