Only one sperm fertilises an egg in normal cases, abnormally there are chances of fertilization by 2 or more sperm cells but such a zygote usually does not survive.
12sperm cells
Four sperm cells form from a single cell that undergoes meiosis.
One because the sperm is one cell and the egg is one cell
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Four sperm cells are produced in males when one diploid cell enters gametogenesis.
Multiple sperm cells are involved in the process of fertilization, but only one sperm cell is needed to penetrate and fertilize the egg cell. Once the sperm cell penetrates the egg, it releases enzymes that break down the egg cell wall, allowing the genetic material of the sperm to enter the egg.
All human gametes (sex cells), which means egg cells and sperm cells, have 23 chromosomes. When the sperm fertilises the egg, the 23 chromosomes from the egg cell and the 23 chromosomes from the sperm cell join to make cells with 46 chromosomes. In summary, all cells in the human body have 46 chromosomes, except sperm cells and egg cells, which have 23.
23 chromosomes in gamaete cells (sex cells)