Dictionary > Allogamy

Allogamy

Definition
noun
(botany) Cross-fertilization, where fertilization occurs when an ovum of a flower is fertilized by the spermatozoa of another flower
Supplement
In flowering plants, fertilization occurs through pollination, i.e. the transfer of pollen from the anther to the stigma of a plant. The pollen contains the male gametes (sperm cells) that are transferred into the female gametophyte (i.e. ovules of flowering plants and the cones of coniferous plants) via the pollen tube. In regard to pollination, the ovum may be fertilized either by cross-pollination or by self-pollination. Cross-pollination refers to the mode of fertilization wherein the sperm is transferred from the anther of a male flower to the stigma of the female flower. This is also referred to as allogamy (in contrast to the autogamy).
Allogamy generally refers to the fertilization of an ovum of an organism with the spermatozoa of another, usually of the same species. Autogamy, in contrast, is a self-fertilization, e.g. fertilization occurring on a flower when the ovum is fertilized with its own pollen (as in self-pollination). Allogamy is advantageous over autogamy with regard to preventing inbreeding depression, which is the reduced biological fitness in a particular population due to inbreeding. Allogamy is more efficient in encouraging the generation of new genotypes than autogamy.
Compare:

See also:

  • fertilization
  • pollination
  • Related form(s):

    • allogamous (adjective, of, relating to, or characterized by, allogamy)


    You will also like...

    Cambial cells
    Plant Tissues

    Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..

    sponge
    Primitive Animals

    Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..

    Population Regulation in an Ecosystem
    Population Regulation in an Ecosystem

    With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

    Oligodendrocyte and Schwann cell
    The Central Nervous System

    Myelin sheath is essential for a faster conductivity of signals. Know more about this feature of some neurons in the Cen..

    Still freshwater and plants
    Still Freshwater & Plants

    Plants in lentic habitats have features not found in terrestrial plants. They acquired these features as they adapt to t..

    Still Water Community Plants
    Still Water Community Plants

    This tutorial looks at the adaptations of freshwater plants for them to thrive in still water habitats. Familiarize your..