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Which part of sperm enters in an egg in a human?

Published in Biology 1 min read

Only the head of the sperm enters the egg during fertilization. The head contains the nucleus, which carries the father's genetic material (DNA).

Here's a breakdown of why:

  • Sperm Structure: Sperm cells are made up of three main parts: the head, midpiece, and tail.
    • Head: Contains the nucleus with the genetic information and an enzyme-filled cap called the acrosome.
    • Midpiece: Contains mitochondria that provide energy for movement.
    • Tail: Propels the sperm towards the egg.
  • Fertilization: The sperm's journey to the egg involves several steps:
    • Acrosome Reaction: The acrosome releases enzymes that break down the outer layers of the egg, allowing the sperm to penetrate.
    • Fusion: The sperm's head fuses with the egg's membrane, delivering the genetic material.
    • Tail Detachment: Once inside, the sperm's tail detaches, leaving only the head with its genetic material.

The fusion of the sperm's nucleus with the egg's nucleus marks the beginning of a new human life.

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