23. the last pair is sex chromosomes. XY for male n XX for female. one will has turner's syndrome if one of his sex chromosomes is absent. n one will has klinefelter's syndrome if he has extra chromosomes in sex chromosomes. so does down's syndrome when he has extra one chromosomes on 21th pair (i guess).<br />
hah. acting like a brilliant kid. ;p
23 pairs chromosomes unless you own a 1959 Mercury, then the number goes up.
Some fewer than others but it doesnt stop them becoming reality tv stars.
Most have 23, but I've been told I have 69.