Characters fall into four classes when related to sex. The first type is represented by horns in cattle, and red, black and white coats in swine, their appearance being entirely independent of sex. At the opposite extreme are those characters that are confined to one sex only, as the male plumage of the Brown Leghorn or pheasant. Similarly, although exhibiting different behavior somatically, are characters like mammae or tusks that exist in a rudimentary condition, or at least a relatively undeveloped condition, in one sex. Characters of this sort are intimately related to the sex glands and removal of the gland in the young animal will usually cause such characters to remain in the juvenile stage.
Proceedings of the Iowa Academy of Science
©1914 Iowa Academy of Science, Inc.
Wentworth, Edward N.
"Sex-Linked Factors in the Inheritance of Rudimentary Mammae in Swine,"
Proceedings of the Iowa Academy of Science, 21(1), 265-268.
Available at: https://scholarworks.uni.edu/pias/vol21/iss1/40