chap 27

Asexual reproduction
- One parent produces genetically identical offspring
- Very rapid reproduction
Asexual reproduction can proceed via:
- Budding
- Fission
- Fragmentation/regeneration
Sexual reproduction
- Involves the fusion of gametes from two parents
- Resulting in genetic variation among offspring
- Increased reproductive success in changing environments
Hermaphroditism
- One individual with male and female reproductive systems
- Easier to find a mate for animals less mobile or solitary
External fertilization
- Many fish and amphibian species
- Eggs and sperm are discharged near each other
Internal fertilization
- Some fish and amphibian species
- Nearly all terrestrial animals
- Sperm is deposited in or near the female reproductive tract
Cleavage
- A rapid series of cell divisions
- More cells
- Embryo does not get larger
Pattern formation
- Organizes the animal's body
- Tissues and organs develop

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chap 27

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chapt 27 bio exam

Updated

2011-04-15T04:07:31Z

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