(Sittin' On) The Dock Of The Bay Lyrics Otis Redding. Sittin' in the morning sun. I'll be sitting when the evening come. Watching the ships roll in. Then I'll watch 'em roll away again (Yeah) I'm sittin' on the dock of a bay. Watching the tide roll away. I'm just sittin' on a dock of a bay.
Down syndrome results when abnormal cell division involving chromosome 21 occurs. These cell division abnormalities result in extra genetic material from chromosome 21, which is responsible for the characteristic features and developmental problems of Down syndrome.
This type of Down syndrome, which accounts for 95% of cases, is called trisomy 21. Down syndrome is usually caused by an error in cell division called nondisjunction.. Nondisjunction results in an embryo with three copies of chromosome 21 instead of the usual two. Prior to or at conception, a pair of 21st chromosomes in either the sperm or the egg fails to separate.