1. Sexual Reproduction

2. Asexual vs Sexual… Feature Asexual Sexual # of parents 1 2
# of offspring
Many
Few
Variety of offspring
None (genetically identical)
Variety (genetically unique)
Speed of reproduction (offspring development)
Fast
Slow
Timing (frequency)
Any time, once mature
Only when a mate is available

3. Conjugation Bacterial cells grow a protein “bridge” between cells
Share genetic info
Creates a bit of diversity!

4. Hermaphrodite
Having complete of partial or partial reproductive structures for both male and female sexes
Produce eggs AND sperm
Ex. Invertebrates such as worms and snails

5. Reproduction in Earthworms
Are hermaphrodites but can’t self fertilize
Exchange sperm cells with another worm
Store these cells in special sac until eggs can be fertilized

6. Reproduction in Sponges
Produce sperm and eggs at different times
Release gametes into the water
Carried by water movement to other sponges

7. External Fertilization
Eggs and sperm fuse outside the body
Aquatic environments
Ex. fish, corals, sponges

8. Internal Fertilization
Sperm and eggs join inside the female
Terrestrial and aquatic organisms
Ex. Sharks, whales, land mammals