A YY Male Goldfish From Mating Estrone-Induced XY Female and Normal Male

A YY male of the goldfish, Carassius auratus, was detected among offspring of an estrone-induced XY female mated with a normal XY male. There is convincing evidence of the reality of inversion of sex differentiation in the XY zygote by estrone as well as male heterogamety (hence, female homogamety)...

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