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...

    Buttress roots
    Roots

    This study guide tackles plant roots in greater detail. It delves into the development of plant roots, the root structur..

    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..

    Circulation
    Circulation

    The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

    Chromosomes X and Y and Sex Determination
    Chromosomes X and Y and Sex Determination

    This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..

    Sensory systems
    Sensory Systems

    A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..

    Related Articles...

    No related articles found

    See all Related Topics