At what stage of Oogenesis would a human egg be ready to receive a sperm" Metaphase of meiosis II Metaphase of meiosis I Immediately after the release of the 2 nd polar body Immediately after the release of the first polar body Only primary Oocytes can be fertilized Activation of the mammalian egg is caused by Ca 2 + release and the activator for such release appears to be stored in the sperm cytoplasm and is delivered to the egg by gamete fusion. True False In sea urchin fertilization, the sperm contributes which of the following to the fertilized egg? Haploid set of chromosomes Mitochoderia Centrioles Both A & C.