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What generation of Mendelian cross has a phenotypic ratio of 3:1?

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in Biology – Class 12 by (271k points)
What generation of Mendelian cross has a phenotypic ratio of 3:1?

(a) F0

(b) F1

(c) F2

(d) F3

This question was posed to me during an internship interview.

This question is from Inheritance Principles topic in chapter Principles of Inheritance and Variation of Biology – Class 12

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Correct choice is (c) F2

The explanation: The phenotypic ratio is the ratio of different phenotypes observed in the progeny. In the F2 generation of a Mendelian cross, there are 75% plants with dominant phenotype and 25% plants with a recessive phenotype. This gives a phenotypic ratio of 3:1.

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