About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 94. Chapters: Flowering plant, Fruit, Fertilisation, Pollen, Pollinator, Histocompatibility, Petal, Stamen, Reproductive isolation, Beekeeping, Pollination syndrome, Stylidium, Pollen source, Pollinator decline, List of crop plants pollinated by bees, Ornithophily, Dichogamy, Zoophily, Pollination management, Cornus canadensis, Ovule, Seed saving, Nectar robbing, Flower constancy, Fruit tree pollination, Carrion flower, Heterostyly, Pollen analysis, Apiary, Pollen tube, Buzz pollination, Theca, Open pollination, Forage, Anemophily, Sporopollenin, Hand pollination, Nectar guide, Column, Spadix, Pollen basket, Sapygidae, Pollen core, Entomophily, Scopa, Pollenizer, Chalaza, Self-pollination, Tricolpate, Oligolecty, Cleistogamy, Trimorphism, Aperture, Pollinium, Melissopalynology, Gonochorism, Herkogamy, Hydrophily, Pollinator exclusion experiment, Orbicule, Geitonogamy, Callichroa, Chemotropism, Chasmogamy, Xenogamy. Excerpt: The mechanisms of reproductive isolation or hybridization barriers are a collection of mechanisms, behaviors and physiological processes that prevent the members of two different species that cross or mate from producing offspring, or which ensure that any offspring that may be produced is not fertile. These barriers maintain the integrity of a species over time, reducing or directly impeding gene flow between individuals of different species, allowing the conservation of each species' characteristics. The mechanisms of reproductive isolation have been classified in a number of ways. Zoologist Ernst Mayr classified the mechanisms of reproductive isolation in two broad categories: those that act before fertilization (or before mating in the case of animals, which are called pre-copulatory) and those that act after. These have also been termed pre-zygotic and post-zygotic mechanisms. The different mechanisms of ...
