Mendel observed two kinds of ratios 3:1 and 1: 2:1 in `F_2` generations in his experiments on garden pea. Name these two kinds of ratios respectively.

Explanation

To answer the question regarding the two kinds of ratios observed by Mendel in the F2 generation of his experiments on garden peas, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Understanding Mendel's Cross**:
- Mendel conducted experiments using garden peas, specifically crossing tall plants (dominant trait) with dwarf plants (recessive trait).
- The genotypes involved are:
- Tall: Homozygous dominant (TT)
...