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Standard XII

Biology

Definition and Significance of Test Cross

When the two ...

Question

When the two parental genotypes BB and bb are crossed, the genotype of all F $_{1}$ plants is Bb. On selfing of F $_{1}$ generation, how many dominant phenotypes will be produced in F $_{2}$ generation?

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25%

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50%

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75%

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100%

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Solution

The correct option is E 75%
When the parents BB and bb are crossed, the gametes formed are B, B and b, b respectively. The genotype of all the offsprings in F $_{1}$ generation is Bb. When Bb is selfed, the gametes will be B and b for both the parents. The progeny produced will be BB, Bb, Bb, and bb. There are 3 dominant phenotypes observed out of total 4 offspring. So, the percentage of dominant phenotypes in F $_{2}$ generation will be 75%.
Thus, the correct answer is option '75%'.

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Q. In the dihybrid cross, the two parental genotypes are AABB and aabb. The genotype of all F

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List I	List II
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When the two parental genotypes BB and bb are crossed, the genotype of all F1 plants is Bb. On selfing of F1 generation, how many dominant phenotypes will be produced in F2 generation?

When the two parental genotypes BB and bb are crossed, the genotype of all F $_{1}$ plants is Bb. On selfing of F $_{1}$ generation, how many dominant phenotypes will be produced in F $_{2}$ generation?