Following in-vitro fertilization, a laboratory technician assesses pronuclei formation. Which outcome suggests normal fertilization, rather than polyspermy or parthenogenetic activation?

💡 Explanation

Normal fertilization results in two pronuclei, one from the sperm and one from the egg, because this indicates successful fusion of genetic material from two gametes. Therefore, two pronuclei indicate correct fertilization, rather than polyspermy (multiple sperm) or parthenogenetic activation (egg activation without sperm).

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