Gregor Mendel — "The pea does not lie."

"Thus, on the average, among four plants two have the hybrid trait Aa, one the parental trait A, and the other the parental trait a. Therefore, 2Aa+ A +a or A + 2Aa + a is the empirical simple series f…"

"The laws of nature are written in numbers."

"It is willingly granted that by cultivation the origination of new varieties is favored, and that by man's labor many varieties are acquired which, under natural conditions, would be lost; but nothing…"

"The constant differential characters of the two parent forms are transmitted to the hybrids unchanged."

"The constant characters which appear in the various generations of a hybrid are those which are transmitted unchanged from the parental plants."