KARYOTYPE A picture of the collection of chromosomes found in an individual’s cells IDENTIFY THIS KARYOTYPE What a karyotype tells you. . . • The number of chromosomes--46 in normal human karyotype • The sex of the individual--23rd pair in humans – XX--human female – XY--human male What a karyotype tells you. . . • Deviations in chromosome number. . . • Down Syndrome--An extra 21st chromosome (trisomy--when a cell has 3 copies of chromosome) • Turner, Klinefelter--error in sex chromosome number. TESTS FOR ACQUIRING KARYOTYPES • Amniocentesis--removal of a small amount of fluid from the sac that surrounds the fetus. • Chorionic Villi Sampling-- Removal of cells from the fingerlike extension of the placenta.
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