Who proposed the term 'Allelomorph'?

Gregor Mendel conducted his hybridization experiments on garden peas for ......... years.

$A$: 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.

Which of the following is the most suitable medium for the culture of $Drosophila$ $melanogaster$?

According to Mendelism, which of the following traits shows dominance?

Define and design a test cross.