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External vs. Internal Fertilization

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Jasnoor Bassi

on 26 July 2013

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Transcript of External vs. Internal Fertilization

External vs. Internal

Advantages and Disadvantages of External Fertilization
What is internal and external fertilization?
Internal fertilization is when the male deposits his sperm directly into the female's body. External fertilization is when the male and female's gametes unite outside the female's body.
Internal Fertilization
There are three types of organisms that use internal fertilization to reproduce:
1) Oviparous - they lay eggs that continue to develop after being laid
2) Viviparous - the young stay in the female body until ready
3)Ovoviviporous - lay eggs that hatch within the mother's body

External Fertilization
The male releases sperms at the same time as the female releases eggs this is called spawning. Some sperms swim through the water in a process called broadcast fertilization and get in contact with the eggs and the eggs get fertilized.
Advantages and Disadvantages of Internal Fertilization
Conditions of internal and external fertilization
- In Watery Environment
- Release of both gametes
- Union of gametes
- Both male and female species are needed.
- Sperm must be placed
inside the female's body
- Release of male gamete
- High chance offspring will survive.
- Requires more energy to find a mate.

- little energy required to find a mate
- large numbers of offspring are produces at one one
- many eggs are fertilized
- embryos are unprotected and often preyed upon
- restricted to wet environment
Animals That Use
Internal Fertilization
Animals That Use
External Fertilization
- few zygotes
- require more energy to
find a mate
Oviparous - most birds and reptiles

Viviparous - All mammals including humans

Ovivivoporous - Boas and pit vipers

Aquatic animals, sea urchin,Almost all aquatic invertebrates and some vertebrates, including the majority of fish and amphibians

July 18
July 21
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