Kuwada (1911, 1915, 1919) was the first investigator who did extensive work on the cytology of maize. He states that the number of bivalent chromosomes varies in different varieties, in different plants of the same variety, and even in different cells of the same plant. In each variety one number is much more prevalent than any other, and this number varies from nine to twelve in the different varieties which he studied. He concludes that twelve is the most frequent number of bivalent chromosomes in most varieties of sweet corn.
Proceedings of the Iowa Academy of Science
©1925 Iowa Academy of Science, Inc.
Reeves, R. G.
"Chromosome Studies of Zea mays L.,"
Proceedings of the Iowa Academy of Science, 32(1), 171-177.
Available at: https://scholarworks.uni.edu/pias/vol32/iss1/26