Egg: | Sperm: |
1. It is the gametes produced by the females of that species. | 1. It is the gametes produced by the males of that species. |
2. It is immotile and large in size. It contains a large amount of cytoplasm and adequate nutrition along with all cell organelles. | 2. It is motile and small in size. It contains a very limited amount of cytoplasm, nucleus and very less mitochondria. |
3. They are metabolically active and live only upto 24 hours in proper environment | 3. They are metabolically passive and can live upto 3 to 5 days after entering the female reproductive system. |
4. One ovum is released at a time. | 4. Millions of sperms are released at one time. |