F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are the same as 1 : 2 : 1. It represents a case of:

Explanation

The F2 generation in a Mendelian cross with a 1:2:1 genotypic and phenotypic ratio indicates a monohybrid cross with incomplete dominance. Let's explain why the other options are incorrect: 1. Codominance: Codominance results in a 1:2:1 phenotypic ratio, but the genotypic ratio would be different. In codominance, both alleles are fully expressed in the heterozygous condition, leading to a 1:2:1 phenotypic ratio, but a 1:2:1 genotypic ratio would not be expected.2. Dihybrid cross: A dihybrid cross typically involves two pairs of contrasting traits and would result in a 9:3:3:1 phenotypic ratio, not the 1:2:1 ratio observed in this case.3. Monohybrid cross with complete dominance: In a monohybrid cross with complete dominance, you would expect a 3:1 phenotypic ratio (3 dominant: 1 recessive) in the F2 generation, which is different from the 1:2:1 ratio observed here. So, the only option that matches the 1:2:1 genotypic and phenotypic ratio is a monohybrid cross with incomplete dominance, where the heterozygous individuals exhibit an intermediate phenotype between the two homozygous parents. The inheritance of flower color in the dog flower (snapdragon or Antirrhinum sp -Codominance results in a 1:2:1 phenotypic ratio, but the genotypic ratio would be different. In codominance, both alleles are fully expressed in the heterozygous condition, leading to a 1:2:1 phenotypic ratio, but a 1:2:1 genotypic ratio would be expected.