Answers are grounded in this paper and cite their sources.
Experiments in which oocytes were inseminated with heterologous spermatozoa showed that Qocytes are susceptible to the same species of sperm, as are the ripe eggs. Immediately after the spermatozoon has entered an egg or an oocyte, material appearing dark in the phase contrast microscope is ejected from the maternal nucleus; a ring-shaped corona is formed around the nucleus. No aster formation takes place in oocytes which have not yet developed the cortical reaction.
No takes yet. Share an insight, caveat, or question.
Hagström et al. (1961) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: