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Learn how exhibitionism has an evolutionary payoff. Help our contestants find the perfect date. This article is about plants. Apomictically produced offspring are genetically identical to the parent plant. Some authors included all forms of asexual reproduction within apomixis, but that generalization of the term has since died out. The sporophytes of plants of these groups may also have the ability to form a plant that looks like a gametophyte but with the ploidy level of the sporophyte, a phenomenon known as apospory. Consequently, there are almost as many different usages of terminology for apomixis in angiosperms as there are authors on the subject.
German speakers might prefer to consult Rutishauser 1967. Caribbean Agave producing plantlets on the old flower stem. In this type, the megagametophyte has the same number of chromosomes as the mother plant because meiosis was not completed. Gametophytic apomixis in flowering plants develops in several different ways.
Two mitotic division give a 4-nucleate megagametophyte, with cell walls to form either three or four cells. Apomixis occurs in at least 33 families of flowering plants, and has evolved multiple times from sexual relatives. Apomictic species or individual plants often have a hybrid origin, and are usually polyploid. It appears unlikely that there are any truly completely apomictic plants, as low rates of sexual reproduction have been found in several species that were previously thought to be entirely apomictic. The genetic control of apomixis can involve a single genetic change that affects all the major developmental components, formation of the megagametophyte, parthenogenesis of the egg cell, and endosperm development.