 Allergies [27]
Allergy is a disorder of the immune system often also referred to as atopy.
Antidepressants [29]
An antidepressant is a psychiatric medication used to alleviate mood disorders, such as major depression and dysthymia.
Arthritis [12]
Arthritis is a group of conditions involving damage to the joints of the body.
Cancer [26]
Cancer is a class of diseases in which a group of cells display uncontrolled growth
Cardio & Blood [1]
Risk factors for heart disease: infections
Cholesterol [2]
A fat-like substance called a lipid. It is used to build cell membranes, hormones and bile acids
Diabetes [23]
The inability of the body to produce, or the inability to metabolize, the human hormone insulin; Diabetes insipidus, usually a disorder of the ...
Epilepsy [6]
Epilepsy is a common chronic neurological disorder characterized by recurrent unprovoked seizures
Gastrointestinal [2]
The digestive tract is the system of organs within multicellular animals that takes in food...
General Health [144]
The infant, child or young person?s current health condition
Herbal [18]
Herbal tea, herbal medicine
Hormonal [21]
Hormones - Proteins produced by organs of the body that trigger activity in other locations.
Men's Health [1]
For men on fitness, health, sex, caree
Pain relief [16]
Pain management is the medical discipline concerned with the relief of pain.
Skin care [15]
The skin is the outer covering of the body
Weight Loss [21]
Loss of body weight by dieting or due to various easting disorders or medical conditions.
Women's Health [20]
Find information on women's health issues, and lifestyle at the Women's Health
Awaiting moderation 17809 Article
|
Down's syndrome - introduction DOWN'S SYNDROME - INTRODUCTION
Down's syndrome or mongolism is due to a genetic disturbance. Yet in only a few cases is it inherited.
Each cell of the human body contains 23 paired chromosomes on which are carried the genes, those chemical markers which determine who and what we are.
The germ cells, which are the ovum from the female and the sperm from the male, are different.
These cells contain only 23 single chromosomes. When they fuse at conception, the new individual then has 23 pairs, half from the mother, half from the father.
One chromosome, normally termed the X chromosome, determines the sex. A female has two X chromosomes whereas the male has only one X chromosome and a smaller and rather insignificant Y chromosome.
All ova contain X chromosomes but the sperm may have an X or Y and whichever one of these fertilises the ovum determines the sex. In Down's syndrome there is an extra chromosome usually at number 21.
This is called 21 trisomy.
*42/71/1*
General health
«Cheap Viagra Online»
 Print
Viewed: 276
| Keywords for this page: Down's syndrome - introduction |
|
|
Fresh materia
What are symptoms of endometriosis: bowel symptoms, bladder symptoms, infertility