Dividing Chromasomes: We all have 22 pairs of regular chromosomes (chms) plus an xx or xy of the sex chms. The pairs split during egg or sperm formation so each has 22 chms + an x or y. If the 21 chromosome doesn't split right & brings a pair to the egg(or sperm) the fertilized egg will have an extra 21 so the infant will have 47 total. All subsequent cells have 47, giving rise to a ds kid.
Answered 8/18/2012
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Chromosomal abnormal: Down syndrome is caused be a chromosomal abnormality tha occurs at the time of fertilization. It is usually associated with the fertilization of an egg carrying2 number 21 chromosomes.
Answered 12/6/2017
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