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Cross between AaBB and aaBB will form

1. 1 AaBB : 1aaBB
2. All AaBB
3. 3 AaBB : 1 aaBB
4. 1 AaBB : 3 aaBB

Correct answer: 1 AaBB : 1aaBB

Solution

Both parents are BB, so every offspring must be BB. For the A locus, Aa × aa gives half Aa and half aa, producing a 1:1 ratio. Therefore the offspring are 1 AaBB : 1 aaBB.

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