Two allelic genes are located on

Mendel obtained recessive character in $F_{2}$ by ...$A$... the ...$B$... plants. Here $A$ and $B$ refer to

Which contributed to Mendel's success?
$I.$ Selection of pea plant
$II.$ Knowledge of history
$III.$ One character at one time
$IV.$ His statistical knowledge
Choose the correct option.

If a dwarf plant is treated with a growth hormone and then crossed with a dwarf plant,what will be the phenotype of the $F_1$ generation?

In his experiments,Mendel observed wrinkled peas. These wrinkles are caused by the accumulation of sugar instead of starch. This is due to the deficiency of which enzyme?

Define/Explain: Genotype.