Sexual Reproduction in Humans

• Advantage of sexual reproduction is not just to help offspring to become better adapted

Sexual reproduction causes genetic recombination which leads to more variety

• A zygote divides to form embryo

• Why is ovum large?

  • Store initial nutrients for development of the embryo

• Why does only one ovum get released at a time?

  • Limited space avaliable for the subsequent development of the embryo

• Less oxygen is supplied to the fetus, not less oxygenated blood