92 In women, gametogenesis begins in fetal life, but is arrested in prophase of meiosis I for years until just before ovulation. This arrested oocyte is called the "primary oocyte". The human genome...
A normal human has 23 pairs of chromosomes, i.e. 64 chromosomes. People with Downes Syndrome have an extra copy of the 21st chromosome so they have 65 chromosomes.