Gametes are exact copies of body cells,but with only half the number of chromosomes.
Gametes are not exact copies of body cells due to gene exchanges such as crossing-over,that occurs during meiosis.

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Gametes undergo meiosis, which includes processes such as crossing-over and independent assortment that result in genetic variation and differences from the original body cells. Therefore, gametes are not exact copies of body cells.

Gametes Are Exact Copies of Body Cells,but with Only Half