Dictionary > Arrhenotoky

Arrhenotoky

Definition
noun
A form of parthenogenesis wherein male offspring develops from an unfertilized egg
Supplement
Parthenogenesis is regarded as a form of asexual reproduction. The offspring develops from an unfertilized egg. Parthenogenesis may be classified based on the sex of the offspring: (1) arrhenotokous parthenogenesis (or arrhenotoky), (2) thelytokous parthenogenesis (or thelytoky), and (3) deuterotokous parthenogenesis (deuterotoky).
The arrhenotoky is a form of parthenogenesis in which the unfertilized eggs develop into males. In contrast, thelytoky is a form of parthenogenesis in which unfertilized eggs develop into females. Deuterotokous parthenogenesis (deuterotoky) is one in which the unfertilized eggs may develop into males and females. Arrhenotoky is seen in species of the order Hymenoptera, such as bees, ants, and wasps. It is also seen in some spider mites, thrips, bark beetles, and rotifers.
Arrhenotoky may be restricted to include only the haploid males that develop from unfertilized eggs. However, others consider diploid males with one inactivated set of chromosomes as a form of arrhenotoky. The diploid males convert their chromosomes into heterochromatin and inactivate them.1
Word origin: Greek arrhēnotokía, arrhēnotók(os), arrhēno– (“male)” + tók(os) (“offspring”)
Also called:

  • arrhenotokous parthenogenesis

Compare:

  • thelytoky
  • See also:

    Related form(s):

  • arrhenotokous (adjective, of, relating to, or characterized by, arrhenotoky)
  • Reference(s):

    1 Nur, U. (1972). “Diploid arrhenotoky and automictic thelytoky in soft scale insects (Lecaniidae: Coccoidea: Homoptera)”. Chromosoma. 39 (4): 381–401.


    You will also like...

    Protein (illustration)
    Protein Variety

    The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..

    Selective Breeding
    Selective Breeding

    Gregor Mendel's studies into Monohybrid and Dihybrid crossing and Charles Darwin's study of evolution and natural select..

    vitamins
    A Balanced Vitamin Diet – Vitamins A – K

    A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..

    Body temperature regulation by the hypothalamus
    Temperature Regulation in Animals

    This tutorial elucidates body temperature regulation. Know the details here to learn how the body sets the body temperat..

    Plant meristem
    Plant Meristems and Growth

    In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..

    Angle Oak Tree
    Seed Plants

    Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..