Compare the amount of cytoplasm and number of organelles in ova to that in sperm.
a) The secondary oocyte (ovum) contains most of the cytoplasm and organelles from the oogonium. During spermiogenesis, the last phase of spermatogenesis, most of the cytoplasm and organelles are stripped from the newly formed sperm, except the nucleus, mitochondria, and acrosome (with lysosomic enzymes).
b) The fertilized ovum (zygote) needs all the organelles for cell division. The sperm needs mitochondria to make energy for the sperm to reach the ovum, and enzymes in the acrosome to penetrate the ovum for the transfer of genetic material for the zygote to be formed.