No.
Mendel, in fact, sent a reprint of his paper to Darwin.
Back then manuscripts came from the printer uncut. To read them one had to slice open the pages.
Darwin's copy of the manuscript Mendel sent him was found uncut.
Darwin never even bothered to open Mendel's manuscript.
In fairness to Darwin, he got lots of mail by that time, and Mendel remained in obscurity for years after he published.