Mendel conducted his hybridization experiments for how many years?

Given below are two statements:
Statement $I$: Back cross is the crossing of $F_1$ hybrid with one of the two parents from which they were derived.
Statement $II$: Test cross involves the crossing of $F_1$ hybrid with its homozygous recessive parent.
In light of the above statements,choose the correct answer from the options given below.

Which of the following is considered as a recessive character of Mendel?

Who reported that factors are inherited and affect the phenotype?

An organism possessing two identical alleles for a particular trait is known as:

Which trait did Mendel $NOT$ select for his experiments?