Question
Mon June 11, 2012 By:
 

zygote divides gradually to form millions of cells by which we are created. then what's the problem with the disabled ones who are disabled by birth. there cells also divides, then why they are not like us?

Expert Reply
Tue June 12, 2012
Birth defects are abnormalities of structure, function, or body metabolism that are present at birth. Birth defects can be caused by genetic, environmental, or unknown factors. For most birth defects, the cause is believed to be an interaction of a number of genetic and environmental factors.
 
Chromosomal abnormalities, maternal illness and drug abuse can cause abnormalities/ disability in newborns.
 
Chromosomes carry the genetic material that is passed on to the baby from each parent. Chromosomal abnormalities usually result from an error that occurs when an egg or sperm cell develops. It is not known why these errors occur.

Egg and sperm cells each contain 23 chromosomes. When they join together, they form a fertilized egg with 46 chromosomes. But sometimes something goes wrong before fertilization. An egg or sperm cell may divide incorrectly, resulting in an egg or sperm cell with too many or too few chromosomes. When this cell with the wrong number of chromosomes joins with a normal egg or sperm cell, the resulting embryo has a chromosomal abnormality. Many children with a chromosomal abnormality have mental and/or physical birth defects. Some chromosomal abnormalities result in miscarriage or stillbirth.
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