With the help of a Punnett square,describe a monohybrid experiment.

(N/A) Punnett square was developed by a British geneticist,Reginald $C$. Punnett.
It is a graphical representation used to calculate the probability of all possible genotypes of offspring in a genetic cross.
The possible gametes are written on two sides,usually the top row and left columns.
All possible combinations are represented in the boxes below,which generates a square output form.
The Punnett square shows the parental tall $TT$ (male) and dwarf $tt$ (female) plants,the gametes produced by them,and the $F_{1}$ '$Tt$' progeny.
The $F_{1}$ plants of genotype $Tt$ are self-pollinated.
The symbols $female$ and $male$ are used to denote the female (eggs) and male (pollen) of the $F_{1}$ generation,respectively.
The $F_{1}$ plant of the genotype $Tt$,when self-pollinated,produces gametes of the genotype '$T$' and '$t$' in equal proportion.
When fertilisation takes place,the pollen grains of genotype '$T$' have a $50$ percent chance to pollinate eggs of the genotype '$T$' as well as of genotype '$t$'.
Also,pollen grains of genotype '$t$' have a $50$ percent chance of pollinating eggs of genotype '$T$' as well as of genotype '$t$'.
As a result of random fertilisation,the resultant zygote can be of the genotypes $TT$,$Tt$,or $tt$.
From the Punnett square,it is easily seen that $1/4$ of the random fertilisation leads to $TT$,$1/2$ leads to $Tt$,and $1/4$ leads to $tt$.
Though the $F_{1}$ has a genotype of $Tt$,the phenotypic character seen is 'tall'.
At $F_{2}$,$3/4$ of the plants are tall,where some of them are $TT$ while others are $Tt$.
Externally,it is not possible to distinguish between the plants with the genotypes '$TT$' and $Tt$.
Hence,within the genotypic pair '$Tt$',only one character '$T$' (tall) is expressed.
Therefore,the character '$T$' or 'tall' is said to dominate over the other allele '$t$' or the dwarf character.