Circle 23rd pair: Sex chromosomes X & Y (male; or XX female)
Ends with 4 sperm containing 23 chromosomes (n); contain either an X or YSeveral hundred million (200 000 000) sperm are produced each day
Most of the Cytoplasm is placed in one cell; 1 in 4 is viable; all XsAt birth each female carries a lifetime supply of developing oocytes, a total of 400-500 eggs