Human reproduction vocabulary: What is the correct term for the event when the nucleus of a sperm cell fuses with the nucleus of an egg cell to form a zygote?

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Introduction / Context:Precise terminology is important in reproductive biology. Several steps occur from mating to pregnancy; only one term refers specifically to the fusion of gamete nuclei to form a zygote.Given Data / Assumptions:Sperm and egg nuclei join to create a diploid zygote.The question asks for the exact biological term for nuclear fusion of gametes.Concept / Approach:The correct term is fertilisation (also called syngamy or karyogamy, depending on emphasis). Other listed words describe broader processes or different stages and are not specific to nuclear fusion.Step-by-Step Solution:Identify the event: gamete nuclear fusion.Map to terminology: fertilisation (syngamy) creates a zygote.Exclude general or behavioral terms (sex, intercourse, reproduction) and implantation.Verification / Alternative check:Standard texts define fertilisation as the union of male and female gametes to form a zygote.Why Other Options Are Wrong:Sex / Intercourse: behavioral acts, not the nuclear event itself.Reproduction: overarching biological process, too broad.Implantation: later event when the blastocyst embeds in the uterine lining.Common Pitfalls:Using everyday language instead of precise biological terms.Final Answer:Fertilisation.

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