chantelhendrix0 chantelhendrix0 20-04-2017 Biology contestada what did Mendel's cross-pollination of pea plants prove? A.certain factors are dominant and, other factors are recessive. B. Crossing a tall plant with a tall plant will always result into a tall plant. C.inheritance of certain factors is dependent upon the genetic code. D.all the cells in an organism carry the same hereditary factors.