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The Journal of Heredity 1984:75(5):353-358
© 1984 The American Genetic Association 75:353-358

research-article

H-Y antigen and the evolution of heterogamety

Dean Nakamura, Stephen S. Wachtel, and Klaus Kallman

Division of Pediatric Endocrinology, New York Hospital-Cornell Medical Center New York, NY 10021
New York Aquarium Osborn Laboratories of Marine Sciences Brooklyn, NY 11224

Abstract

In natural populations of platyfish, Xiphophorus maculatus, there are three sex chromosomes—W, X, and Y. Females may have one of three genotypes: WY, WX, or XX, and males may have either XY or YY. The W chromosome can be considered a modified X that blocks the male-determining function of the Y. The platyfish may represent an evolutionary stage at which female heterogamety arises through a single mutation, in the midst of a male heterogametic system. Our serological analysis revealed presence of H-Y antigen in XY and YY males, but not in XX, WX, or WY females, Indicating that H-Y antigen may not be associated invariably with the heterogametic-type gonad—especially in transitional systems.


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