“…(1961), Bruell (1962), and Newell (1967) uses two inbred strains (Pi and P 2 ), their FI, F 2 , and backcrosses. The analysis of the classic method employed here is derived from Cavalli's (1952) joint test for epistasis, and is explained more fully by Katzenmeyer, Whitney, and Newell (1969). Briefly, genetic parameters estimate genetic influences due to additive genetic effects, d, dominant genetic effects, h, and epistatic effects, i, j, and 1.…”