Phenotypic manifestations during the development of the dominant and default gonads in mammals and birds.

Abstract excerpt

The dominant embryonic gonad--testis in mammals and ovary in birds--secretes one or more morphogenetic substances that exert a major effect on the phenotype of the embryo. When deprived of their gonads, mammalian embryos develop into females, and avian embryos assume predominantly male characteristics, although retaining both oviducts. In order to fulfill their task of masculinizing the reproductive tract,...

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