The union of two gametes, occurring when a haploid sperm and a haploid egg join to produce a diploid zygote containing 46 chromosomes is known as ______________________.

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Fertilization is the process of fusion of haploid sperm and haploid egg to form a diploid zygote, which contains 46 chromosomes. Menopause is a natural process occurring in women where menstruation stops, and there is a decline in reproductive hormones. Andropause is a decline in testosterone production in men, leading to a decrease in fertility. Mitosis is the process of cell division where a diploid cell divides to form two identical diploid daughter cells. None of these processes involve the fusion of sperm and egg to form a zygote.

The Union of Two Gametes, Occurring When a Haploid Sperm