birth defects in the world. It is a chromosomal abnormality

which results in 47 chromosomes, instead of 46, with an extra

chromosome being 21. Because the majority of Down syndrome

cases affect the twenty-first chromosome, it is commonly called

Down syndrome is usually caused by a cell division error,

which is known as non-disjunction. This occurs when an embryo

develops with three number 21 chromosomes instead of two. This

excess genetic material alters the course of development and

causes the characteristics of this syndrome. The cause of this

faulty cell division is still unknown, although there seems

Some common words found in the essay are:
, Online Available, people syndrome, Cited Unknown, Downsyndromehtml Unknown, twenty-first chromosome, unknown author, online available, maternal age types, age types syndrome, unknown author syndrome, children syndrome, chromosomes 46, mental retardation, author syndrome, cell division, chromosomes instead,
Approximate Word count = 466
Approximate Pages = 2 (250 words per page double spaced)