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Down Syndrome 2
Down syndrome is one of the most frequently occurring
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
"trisomy 21."
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 chara ....
Word count: 474 - Page count: 2
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