down syndrome (trisomy 21) result of an extra chromosome 21 1:700 children characteristic facial...
TRANSCRIPT
Down Syndrome (trisomy 21)
• result of an extra chromosome 21
• 1:700 children• characteristic facial features,
short stature; heart defects, shorter lifespan… etc.
• has been correlated to the age of the mother but can also be result of nondisjunction of father’s chromosome 21
Patau Syndrome (trisomy 13)
• serious eye, brain, circulatory defects as well as cleft palate
• 1:5000• children rarely live more
than a few months
Klinefelter syndrome: XXY
• 47 chromosomes• affects the
sexual/gender specific characteristics
• Usually male sex organs with other female body characteristics
• Normal intelligence
Trisomy X
• XXX metafemales• 1:1000 live births• healthy and fertile• usually cannot be
distinguished from normal female except by karyotype