Dictionary > Pseudodominance

Pseudodominance

Definition
noun
(genetics) The manifestation of a recessive trait, mimicking an inheritance of a dominant pattern
Supplement
In genetics, the property of a gene or an allele to be expressed over the other gene in a pair is referred to as dominance. When a gene (allele) is expressed it is described as dominant. A gene that is not expressed is said to be recessive. The absence of a dominant gene leads to the expression of the recessive gene. This can be observed particularly in homozygous alleles. It implies that both paternal and maternal alleles inherited by the offspring are recessive. There are instances though when the pattern of phenotypes does not correspond to this inheritance pattern. There are situations wherein only one recessive allele is inherited and yet is expressed. This is called pseudodominance. The recessive trait is manifested as if it follows the pattern of inheritance of a dominant allele. Many of X-linked genetic disorders in males are pseudodominant. Since males receive one X chromosome and one Y chromosome, the recessive gene in the X chromosome leads to its expression. Haemophilia in males is an example of pseudodominance. The gene responsible for the manifestation of haemophilia in males is recessive and X-linked.
Variant(s):

  • pseudo-dominance

Synonym(s):

  • quasidominance
  • false dominance
  • See also:

    Related form(s):

  • pseudodominant (adjective, of, pertaining to, or characterized by pseudodominance)


  • You will also like...

    Sugar Homeostasis
    Sugar Homeostasis

    The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..

    New Zealand Flora & Fauna
    Ecology & Biodiversity: New Zealand Flora & Fauna

    New Zealand is known for its unique biodiversity, caused by its remarkable geography and geologic history. Breaking away..

    Control of body movement
    Control of Body Movement

    Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern ..

    Balanced Diet
    A Balanced Diet – Minerals and Proteins

    Proteins and minerals can be derived from various dietary sources. They are essential for the proper growth and developm..

    Freshwater lake ecosystem
    Freshwater Producers and Consumers

    Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..

    Thermographic image of face and neck
    Regulation of Organic Metabolism, Growth and Energy Balance

    The human body is capable of regulating growth and energy balance through various feedback mechanisms. Get to know the e..

    Related Articles...

    No related articles found

    See all Related Topics