1. Sexual and Asexual reproduction

3. # of Parents Sexual Asexual Two parents give DNA to offspring
One parent gives DNA to offspring

4. Genetic Variation Sexual Asexual
Offspring is genetically unique from parents
Offspring is identical to (a clone) its parent

6. Mechanism Sexual Asexual
Involves egg and sperm (gametes) which combine (fertilization)
no egg AND sperm involved

7. Parental care Sexual Asexual parents usually care for their offspring
usually no parental care

9. EXAMPLES: Asexual BUDDING – a bud grows off a parent
hydra sponge yeast

10. EXAMPLES: Asexual FISSION – splits in two equal parts
bacteria amoeba euglena

11. EXAMPLES: Asexual FRAGMENTATION – parent breaks into
pieces which form new individuals
blackworms coral

12. EXAMPLES: Asexual
REGENERATION – an organism can grow a replacement body part
starfish planarian

13. EXAMPLES:Asexual
SPORE – asexual reproductive cell
fungi ferns

14. EXAMPLES: Asexual VEGETATIVE PROPAGATION – ability
of plants to produce new plants from
part of the original plant
- spider plants, aspen trees, strawberries

15. EXAMPLES: Sexual FERTILIZATION – mixing of male and female genes
protists plants animals

16. pollination/fertilization

18. ADVANTAGES: Sexual have a mate (to help with offspring, etc.)
can choose the “best” traits in mate
increased variation/variety
less likely for bad genes/traits to be
passed on
good for CHANGING environments

19. ADVANTAGES: Asexual don’t have to find a mate
(good if you can’t or don’t move)
get more offspring faster
doesn’t take much energy
all of the genes are passed on
good in STABLE environments

20. Which produces more offspring faster?

21. DISADVANTAGES: Sexual
may not choose the best mate
Only 50% of genes passed on
takes more energy
less offspring
takes longer

22. DISADVANTAGES: Asexual
no variety – every one is the same
fight for food and space
all bad genes/traits are passed on
not good for changing environments

23. Credits