Origin of Species
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Discusses the nature of species and the essential role that reproductive isolating mechanisms have in their origin. Pictures the existence in nature of a number of reproductive isolating barriers (ecological, seasonal, sexual, hybrid inviability, hybrid sterility). Indicates that any particular barrier has a multiple genic or chromosomal basis and that any two species are separated via a number of reproductive barriers. Stresses the lack of correlation between morphology and reproductive isolation. Lecture given by Dr. G. L. Stebbins.
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