Dictionary > Haplodiploidy

Haplodiploidy

Definition
noun
A biological system of sex determination as observed in the Hymenopteran species (e.g. ants and bees) where unfertilized haploid eggs develop into males and fertilized eggs, into females
Supplement
The sex-determination system, as the name implies, determines the sexual characteristics of an organism. The sex of an organism may be determined internally (genetic) or externally (e.g. by environmental and social variables). In most species, sex determination is determined genetically, i.e. male or female based on the sex chromosomes. Chromosomal systems include XX/XY sex-determination system, Y-centered sex determination, X-centered sex determination, X0 sex-determination system, ZW sex-determination system, and haplodiploidy.
Haplodiploidy is a biological system of sex determination where unfertilized haploid eggs develop into males and fertilized eggs, into females. It is observed in the Hymenopteran species (e.g. ants, bees, and wasps). For instance, the queen honeybee would have three types of offspring based on their social function: female worker bees, male drones, and the new queen bee. Female worker bees and the new queen bee develop from fertilized eggs and are therefore diploid. However, the female worker bees would be sterile. The unfertilized eggs develop into male drones through parthenogenesis, and are haploid individuals.
Haplodiploidy is also seen in thysanopterans (‘thrips’), and in some spider mites, Hemiptera, Coleoptera (bark beetles), and rotifers.
See also:

Related form(s):

  • haplodiploid (noun, a cell or an organism displaying haplodiploidy; adjective, relating to haplodiploidy)


  • You will also like...

    Kidneys
    Kidneys and Regulation of Water and Inorganic Ions

    The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..

    Neurology of Illusions
    Neurology of Illusions

    Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..

    Protein (illustration)
    Protein Variety

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

    DNA molecule
    Genetic Control – On and Off Genes

    Genes are the blueprint of our bodies, a blueprint that creates a variety of proteins essential to any organism's surviv..

    Homo Species
    The Homo Species

    The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..

    Cell structure
    Cell Structure

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

    Related Articles...

    No related articles found

    See all Related Topics