Dictionary > Y linkage

Y linkage

Definition
noun, plural: Y linkages
(genetics) A form of sex linkage involving particularly the Y chromosome
Supplement
Sex linkage is the phenotypic expression of a gene occurring in the sex chromosome. The manifestation of certain traits is due to the expression of the genes located in the sex chromosome.
In humans and other mammals, the sex chromosomes are the X chromosome and the Y chromosome. Females would have two X chromosomes and males have one X chromosome and one Y chromosome. As such, sex linkage may be classified as X linkage or Y linkage. X linkage is a sex linkage involving the X chromosome whereas Y linkage is a sex linkage involving the Y chromosome. Since there are more genes in the X chromosome than in the Y chromosomes there are more X-linked traits than Y-linked.
Y linkage is the state of a genetic factor (gene) being borne on the Y chromosome. Since the Y chromosome does not fully take part in chiasma formation and recombination, it is not amenable to analysis by conventional linkage methods. Thus, little is known about its content. There is a gene for the h-Y antigen, and indirect arguments suggest that there is a principle that determines the formation of the testis and masculinization of the fetus but its localization, though narrowing the limits, remains elusive.
Compare:

  • X linkage

See also:

  • Y-linked inheritance
  • Y-linked gene


    You will also like...

    Circulation
    Circulation

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

    Growth and Plant Hormones
    Growth and Plant Hormones

    Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..

    Freshwater aquatic plankton
    Freshwater Communities & Plankton

    Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..

    The process of photosynthesis
    Photosynthesis – Photolysis and Carbon Fixation

    Photosynthesis is the process that plants undertake to create organic materials from carbon dioxide and water, with the ..

    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..

    Muscle
    Muscle

    Muscle cells are specialized to generate force and movement. Learn about the different types of muscle tissues in this t..