Genotypic ratio of Mendelian Monohybrid cross in F2 generation is

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  1. 3:1
  2. 1:1 
  3. 1:0
  4. 1:2:1

Answer (Detailed Solution Below)

Option 4 : 1:2:1
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The correct answer is 1:2:1

Key Points

  • The genotypic ratio of a Mendelian monohybrid cross in the F2 generation is 1:2:1.
  • This ratio represents the genetic constitution of offspring: 1 homozygous dominant, 2 heterozygous, and 1 homozygous recessive.
  • Gregor Mendel derived this ratio from his experiments with pea plants.
  • In this cross, the F1 generation is always heterozygous, while the F2 generation shows segregation of alleles.

Additional Information

  • Mendelian Genetics: Mendel's laws of inheritance include the Law of Segregation, which explains the 1:2:1 genotypic ratio in F2 generations.
  • Homozygous vs. Heterozygous: Homozygous organisms have identical alleles for a gene (e.g., AA or aa), while heterozygous organisms have different alleles (e.g., Aa).
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