The correct option is B A- 1856-1863, B- 28,000
Gregor Johann Mendel, an Austrian monk is regarded as the Father of Genetics. He was the first person to describe the manner in which traits or characters are passed on from one generation to the next correctly. Mendel conducted hybridization experiments on garden pea (Pisum sativum) for eight years (1856-1863). One reason behind choosing pea as a model plant for the experiment was that many varieties are available with distinct and visible characteristics. Mendel performed experiments with nearly 28,000 plants of pea in seven years in summarising his findings on genetics.