The segregation of paired hereditary factors that Mendel postulated occurs during

The synthesis of starch in pea seeds is controlled by a single gene. This gene has two alleles,$B$ and $b$. If the shape of the pea seed is considered as the phenotype,what type of inheritance does this represent?

Which one of the following was the rediscoverer of Mendel's work?

The alleles are

$A$: Mendel proposed postulates like "principles of segregation and principles of independent assortment" after studying seven pairs of contrasting traits in garden pea.
$R$: He was lucky in selecting seven characters in pea that were located on seven different chromosomes.

Mendel observed that all $F_1$ progeny plants: