Who rediscovered Mendel's results on inheritance?

Statement-$I$: The segregation of alleles is a random process and so there is a $50\%$ chance of a gamete containing either allele.
Statement-$II$: Alleles do not show any blending at either $F_1$ or $F_2$ generation.

An allele is said to be dominant if

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

In genetics,the use of a checkerboard was introduced by

Mendel crossed tall and dwarf plants. In the $F_{2}$-generation,the observed ratio was $3: 1$ (tall: short). From this result,he deduced:
$I.$ Law of dominance
$II.$ Law of independent assortment
$III.$ Law of segregation
$IV.$ Incomplete dominance
Choose the correct option.