1. BIOLOGY 11DM MRS. HAUGHTON
ASEXUAL REPRODUCTION
BIOLOGY
11DM
MRS. HAUGHTON

2. SEXUAL AND ASEXUAL REPRODUCTION
Reproduction is the way in which organisms (parents) produce new individuals (offspring) of their own species.
The two types of reproduction are
Asexual and
Sexual

3. Comparing Asexual and Sexual Reproduction
One parent.
Mitosis responsible for offspring formation.
Offspring identical to parent and one another (clones).
No variety
Two parents.
Meiosis makes sex cells that fuse together.
Genes are mixed so offspring different from parents and one another.
Variety

4. Advantages of Asexual Reproduction
Offspring all exactly alike and like parents.
Less risky way of reproduction (simple).
Happens very quickly.

5. Disadvantages of Asexual Reproduction
Since all offspring the same, they will be vulnerable to all the same illness and problems.
Organisms cannot adapt to changes easily.
Overcrowding, competition and death more likely to occur.

6. Examples of Asexual Reproduction
BINARY FISSION in Amoeba
Organism grows to a certain size.
The nucleus then cytoplasm with all structures duplicates and divides.
Two new identical organisms formed which then grow.

7. Examples of Asexual Reproduction
BUDDING IN YEAST

9. Examples of Asexual Reproduction
SPORE FORMATION IN BREAD MOULD
Some threads (filaments) of bread mould grow upright and form spore cases.
The spores are later released to grow new filaments on a new source of food.

12. Plants also reproduce asexually.
Two ways are:
Natural (vegetative/storage organs form)
Artificial (man manipulates plants)

13. After photosynthesis, plants store extra glucose as starch or other sugars.
These storage organs ensure that food is available when a new organism is ready to grow from the existing parent plant.

14. NATURAL VEGETATIVE PROPAGATION
Examples are: (see page Concise for pix)
Underground stem (ginger, Irish potato)
Above ground stem (sugarcane)
Roots (carrot)
Underground leaves (onion)
Fruits
Seeds

15. UNDERGROUND STEM
RHIZOME (ginger)
CORM (dasheen)

16. UNDERGROUND STEM
STEM TUBER (Irish potato)
STEM TUBER (Irish potato)

17. ABOVE-GROUND STEM
SUGARCANE
CELERY

18. ROOTS
TAP ROOTS (carrot)
TAP ROOTS (turnip)

19. UNDERGROUND LEAVES
BULB (onion)
BULB (Lilly)

20. Other ways that plants reproduce asexually are: (see page Concise for pix)
Runners (pumpkin, strawberry)
Suckers (Banana, plantain)
Leaf buds (leaf of life)

21. RUNNERS

22. SUCKERS

23. LEAF BUDS

25. ARTIFICIAL ASEXUAL PLANT REPRODUCTION
Done by man to assist in reproduction.
Cutting
Budding / Grafting

26. CUTTING

27. BUDDING / GRAFTING