SELECTION FOR REPRODUCTIVE ISOLATION BETWEEN TWO POPULATIONS OF MAIZE, ZEA MAYS L. ,

@article{Paterniani1969SELECTIONFR,
  title={SELECTION FOR REPRODUCTIVE ISOLATION BETWEEN TWO POPULATIONS OF MAIZE, ZEA MAYS L. ,},
  author={Ernesto Paterniani},
  journal={Evolution},
  year={1969},
  volume={23}
}
In considering the origin of reproductive isolation, two theories, which are not mutually exclusive, have been advanced. Muller (1939) considers that reproductive isolation between two subspecies is just a consequence of their genetic divergence following selection in geographic isolation. In this way, as the divergence proceeds, genes that prevent free interbreeding will be incorporated into the genotypes of the two subspecies. On the other hand, Dobzhansky (1940) holds that divergence does… 

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One of the most imiportant problems in the study of speciation has been that of the origin of reproductive isolating mechanisms, for it is by the building up of intrinsic barriers which prevent gene

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The mechanism proposed by Dobzhansky (1937) is that when sufficient divergence between two species has arisen so that the hybrids are less well adapted for any available habitat than either parental type, there will be selection for sexual isolation.

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A series of experiments directed, for the first time, toward the study of the genetics of sexual isolation, i.e., of isolation in the process of formation, between subspecies, are described.

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An attempt is made to weaken as well as to strengthen the ethological isolation between two closely related species; and progress in selection is measured in the two sexes of each species separately, so that differential effects become apparent.

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The inverse correlation between interspecific geographical and crossing relationships provides critical evidence in the case of the Leafy-stemmed Gilias, and supporting evidence for the hypothesis of a selective origin of hybridization-preventing mechanisms in annual plants under conditions of sympatry.

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T H E ability of the male gamete to effect fertilization is generally assumed to be independent of its genetic constitution. The validity of this assumption has been reinforced by the fact that for

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Plants of this species thrive under a wide range of cultural conditions and flower profusely throughout the year, and the prevailing self-incompatibility expedites hybridizations.

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A theory is suggested according to which the development of isolating mechanisms follows, rather than accompanies, that of the adaptive complexes themselves, which suggests that speciation is meant the fixation of discontinuity among organisms.

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The prepotency of self pollen over foreign pollen was rediscovered by Jones some years later in maize, and other plants are now known to follow this rule.