Can you give me some information on Gregor Mendel and what he accomplished?

Gregor Mendel a scientists born on July 20, 1822, in Hynčice, Czech Republic. He was largely ignored during his lifetime, but around half a century later after he died, his work was found to be ahead of his time. He is credited with discovering basic heredity, such as alleles:

Aa parent and Aa parent produces AA, Aa, Aa, and aa offspring.

He died January 6, 1884, in Brno, Czech Republic.