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chromosomes
contain the genetic blueprints for cellular function (genes and DNA)
genetic information
can be replicated by cell division and passed onto offspring by inheritance
karyotype
a photographic inventory of an individual’s chromosomes
23 pairs of chromosomes (46 total)
23rd determines sex
monosomy
missing chromosome
45 chromosomes
trisomy
extra chromosome
47
down syndrome (trisomy 21)
occurs in the 21st pair
most common chromosome-number abnormality
klinefelter syndrome
XXY
biologically male
some female 2nd characteristics may develop
usually unable to reproduce
Jacobs syndrome
XYY
biologically male
tend to be taller than average
delayed motor development
poor muscle tone
turner syndrome
XO
biologically female
may not fully develop 2nd characteristics
usually unable to reproduce