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...

    Lotic community of algal species
    Lotic Communities & Algae

    Lotic communities have conditions that are rather harsh for typical plants. Thus, the diversity of plant species in loti..

    The Human Physiology
    The Human Physiology

    Physiology is the study of how living organisms function. Thus, human physiology deals specifically with the physiologic..

    Human perception in action
    Human Perception – Neurology

    This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..

    Direct and indirect physiologic effects of growth hormone
    Animal Growth Hormones

    Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..

    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..

    Young plant growing from the soil.
    Soils

    Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..