how do we confirm that the f2 generation have 1:2:1 ratio of TT ,Tt&tttrait combinations?
The phenotypic and genotypic ratio can be confirmed through a punnet square.
Punnett square
- Graphical representation to calculate the probability of all possible genotypes of offsprings in a genetic cross
- Possible gametes are written on two sides, usually at top row and left columns, and combinations are represented in boxes.
- With the help of Punnet square, genotypic ratio in F2 generation can be found. From the above given Punnet square, it is evident that genotypic ratio TT: Tt: tt is 1:2:1.