This study comprised 544 nuclear families with 2,935 individuals teste
d for the Mitsuda reaction, from the Campinas region in Brazil. Segreg
ation analyses suggest the segregation of a major gene (chi(1)(2) = 0.
07 - 0.07 = 0, p = 1), by failing to reject the hypothesis of Mendelia
n transmission and by rejecting the hypothesis of nontransmission of a
major gene (chi(3)(2) = 0.07 - 0.0 = 0.07, p > 0.99; chi(2)(2) = 198.
28 - 0.0 = 198.28, p < 0.0001).