What is the genetic ratio of the F2 generation if members of F generation are allowed to self-pollinate?
- 1 tall : 3 short
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3 tall : 1 short
- 1 tall : 1 short
- 4 short : 0 tall
- 4 tall : 0 short
The correct answer is: B
Explanation
If members of the F1 generation are allowed to self-pollinate, the genetic ratio in the F2 generation will be 1:2:1 (homozygous dominant: heterozygous: homozygous recessive) for a monohybrid cross, meaning a single gene trait is being studied.
Explanation:
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F1 generation:
When two homozygous parents with contrasting traits are crossed, the F1 generation will all be heterozygous, exhibiting the dominant phenotype.
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Self-pollination of F1:
When these F1 heterozygotes self-pollinate, the offspring in the F2 generation will segregate the alleles according to Mendel's law of segregation, resulting in a 1:2:1 genotypic ratio.
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The genetic ratio of the F2 shows that there will be 3 tall and 1 short offspring plants.(See diagram above)