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...

    Cell structure
    Cell Structure

    A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, G..

    A sperm cell fertilizing an ovum
    Human Reproduction and Fertilization

    For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

    Regulation of Biological Systems
    Regulation of Biological Systems

    Regulation of Biological Systems tutorials are focused on the modulation of biological systems from cell to population l..

    Psychiatry and mental disorders
    Psychiatry & Mental Disorders

    Different mental disorders are described here. Read this tutorial to get an overview of schizophrenia, affective mood di..

    Human Nervous System
    The Human Nervous System

    The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..

    Adaptive Radiation
    Adaptive Radiation

    The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..