Mercy Hospital & Health Services Contact Us
MyChart
About Mercy
Join Our Team
set font size large set font size medium set font size small
email this page print this page
Health Illustrated Encyclopedia Banner
Health Illustrated Encyclopedia

Disclaimer:
Our Health Information Database is provided by A.D.A.M. the leading provider of electronic and printed information for professionals and consumers in healthcare and industry. It provides authoritative, reliable content written and reviewed by an editorial board who represent a variety of specialty areas. This board reviews and evaluates all healthcare information to ensure it is accurate, reliable, and can be used with complete confidence. And now you have access to the same authoritative, trusted clinical information relied upon by health professionals around the world.
Autosomal recessive

Definition

Autosomal recessive is one of several ways that a trait, disorder, or disease can be passed down through families.

An autosomal recessive disorder means two copies of an abnormal gene must be present in order for the disease or trait to develop.

Alternative Names

Genetics - autosomal recessive; Inheritance - autosomal recessive

Information

Inheriting a specific disease, condition, or trait depends on the type of chromosome affected (autosomal or sex chromosome). It also depends on whether the trait is dominant or recessive.

A mutation in a gene on one of the first 22 nonsex chromosomes can lead to an autosomal disorder.

Genes come in pairs. Recessive inheritance means both genes in a pair must be defective to cause disease. People with only one defective gene in the pair are considered carriers. However, they can pass the abnormal gene to their children.

CHANCES OF INHERITING A TRAIT

If you are born to parents who both carry an autosomal recessive change (mutation), you have a 1 in 4 chance of getting the malfunctioning genes from both parents and developing the disease. You have a 50% (1 in 2) chance of inheriting one abnormal gene. This would make you a carrier.

In other words, if four children are born to a couple who both carry the gene (but do not have signs of disease), the statistical expectation is as follows:

  • One child is born with two normal genes (normal)
  • Two children are born with one normal and one abnormal gene (carriers, without disease)
  • One child is born with two abnormal genes (at risk for the disease)

Note: This does not mean that children will necessarily be affected.

See also:

References

View Spanish Version

Encyclopedia Home
Drug Note Home
Health Information Home

Images

Care Points
    Read More

    Review Date: 4/26/2010

    Review By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

    The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2010 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

    www.adam.com
    www.mercyweb.org
    follow us online
    facebook youtube


    Contact us
    Home  |  Sitemap

    Disclaimer & Terms of Use  |  Privacy Statement  |  Notice of Privacy Practices
    Copyright ©2013 Mercy. Last modified 2/16/2011