In a flowering plant, tall (t) is dominant to short (t), and blue flowers (b) is dominant to white flowers (b). a tall plant with white flowers (ttbb) is crossed with a short plant with blue flowers (ttbb). what is the chance that the offspring will be short with white flowers?

25%

Following a cross between Ttbb and ttBb, the resulting offspring would be:

TtbB , TtbB , Ttbb , Ttbb , ttbB , ttbB , ttbb , ttbb , TtbB , TtbB , Ttbb , Ttbb , ttbB , ttbB , ttbb , ttbb

To have a clearer idea, see the attached image.

Of the 16 possible combinations from this dihybrid cross, there will be:

4 tall plants with blue flowers

4 tall plants with white flowers

4 short plants with blue flowers

4 short plants with white flowers

There are 4 possible genotypic recombinations that would yield short plants with white flowers out of a possible 16, so the chance that the offspring will be short with white flowers would be 4/16 which is 1/4 or 25%

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