Mendel obtained pure-breeding pea lines by:

Mendel selected pea plants for his experiments because of $..........$.

If a normal woman marries an albino man and their offspring are half albino and half normal,then the woman is:

The $1/4 : 1/2 : 1/4$ ratio of $TT : Tt : tt$ can be depicted mathematically by the binomial expression (ideally):

What is the primary purpose of a test cross?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: In an experiment, Mendel observed that the $F1$ progeny plants are all tall and none are dwarf.
Reason $R$: Stem height is a contrasting trait, with tall being dominant and dwarf being recessive.
In the light of the above statements, choose the most appropriate answer from the options given below: