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...

    squirrel
    Animal Water Regulation

    Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..

    Plant Water Regulation
    Plant Water Regulation

    Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..

    Water Cycle
    The Water Cycle

    The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

    Adaptation Tutorial
    Adaptation Tutorial

    Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

    Plant biology
    Plant Biology

    Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..

    Early Earth
    The Origins of Life

    This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..