The true moment of fertilization occurs when what happens?
1. Cortical reaction occurs
2. Nuclei unite
3. Spermatozoa propel themselves up the female tract
4. Sperm surrounding the ovum release their enzymes
2
Explanation: 2. The true moment of fertilization occurs as the nuclei unite. Their individual nuclear membranes disappear, and their chromosomes pair up to produce the diploid zygote.
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