Table of Contents
Activity 9.2 NCERT Class 10 Science, Heredity and Evolution
Activity 9.2 asks us to conduct an experiment to prove that the genotypic ratio in the f2 generation is 1:2:1
Answer:
We cross each of the seeds obtained in the f2 generation with a pure recessive variety to confirm the genotypic ratio.
Explanation:
In Mendelian inheritance, we get a phenotypic ratio of 3:1 and genotypic ratio of 1:2:1. Phenotypic ratio is easily detectable by the trait, but we can not confirm the genotypic ratio by phenotype. So to know the genotypic ratio we cross-pollinate the f2 generation with a pure recessive variety. We call this process a Test Cross.
Different genotypes give a different result with a test cross. As a result, we can now calculate the genotypic ratio.
See also: Related questions from Heredity and Evolution.
