1. Table Talk What are at least 2 reasons why cells must divide?
Use any/all notes so far from today or yesterday and TALK about the following questions with everyone at your table. Then, select one person to share OUT LOUD for each question…3 different people!
What are at least 2 reasons why cells must divide?
How is cell division different for prokaryotes and eukaryotes?
What happens to the DNA of all cells before a cell can divide?

2. Introduction to Cell Reproduction
Asexual Reproduction

3. What is CELL REPRODUCTION?
The process of making new individual organisms.

4. REPRODUCTION Reproduction is different for Prokaryotes and Eukaryotes.
There are 2 main types of reproduction:
ASEXUAL –both prokaryotes and eukaryotes
SEXUAL – only eukaryotes
Let’s take a closer look!

5. 2 Types of Reproduction ASEXUAL REPRODUCTION SEXUAL REPRODUCTION
Process where 1 parent cell divides and produces genetically identical offspring. Also called CLONING!
A new organism is created by combining the genetic material of 2 organisms in a process that starts with meiosis, a type of cell division. Occurs only in eukaryotes.

6. Types of Asexual Reproduction in Prokaryotes
Binary Fission
Bacteria divide into 2 equal and identical parts
NOTICE: BEFORE the cell divides, the DNA is replicated!!!

7. Types of Asexual Reproduction in Eukaryotes
1. Binary Fission
Unicellular (single-celled) organisms divide into 2 cells

8. Types of Asexual Reproduction in Eukaryotes
2. Budding
Unicellular organisms like yeast and protists divide into 2 identical cells

9. Types of Asexual Reproduction in Eukaryotes
3. Vegetative Propagation
Asexual reproduction in plants.
Parent organism
Genetically Identical Offspring

10. Types of Asexual Reproduction in Eukaryotes
4. Spore formation
Many multicellular organisms like ferns use spores during their life cycle

11. 5. Regeneration
Replacement, renewal or re-growth of lost or damaged body parts; common in invertebrates

12. Types of Asexual Reproduction in Eukaryotes
All use MITOSIS!

13. ASEXUAL or SEXUAL?
Complete the chart as we view and discuss the next 7 pictures of organisms reproducing.

14. SEXUAL or ASEXUAL? Budding Yeast
Budding– daughter cells pinches off parent cell
For each mitotic division, a genetically identical copy of the parent is made, for a total of 2 cells

15. SEXUAL or ASEXUAL? Budding Hydra
Budding– daughter cells pinches off parent cell
– a genetically identical copy of the parent is made

16. SEXUAL or ASEXUAL? Bacteria Reproducing
Binary Fission – splitting in half
Parent bacteria splits to make a genetically identical offspring
End result is 2 identical cells

17. SEXUAL or ASEXUAL? Pine Tree Reproduction
Cones produce pollen which are sex cells (plant sperm)
Some cones produce ovules (eggs)
Pollen and eggs join during fertilization
2 parent pine cones will combine their genetic material to make a new genetically different (but similar) plant

18. SEXUAL or ASEXUAL? Flowering Plant ReproductionAf
SEXUAL
Flowers contain both pollen (sperm) and ovules (eggs) which are sex cells. These are also called gametes.
During fertilization - 2 sets of DNA combine to make the new (genetically different, but similar) flower

19. SEXUAL or ASEXUAL? Peacock and Peahen
Peahens produce eggs and peacocks produce sperm. The sperm will fertilize the egg and produce a zygote, which will grow into an embryo.
2 parent peacocks will combine their genetic material to make a new, genetically similar, but different bird

20. SEXUAL or ASEXUAL? Binary Fission of Paramecium
Binary Fission – splitting in half
A single parent protist splits to make one new genetically identical offspring
Total cells at the end = 2

21. One extra …SEXUAL or ASEXUAL? Mushroom Sporulation
The mushroom produces spores which grow into genetically identical offspring

22. Drawing Conclusions Noticing Trends?
What general conclusions can you draw about reproduction in plants?
What general conclusions can you draw about reproduction in animals?
What general conclusions can you draw about reproduction of simpler, unicellular organisms such as bacteria, yeast, and hydra?

23. Complete the Chart Characteristic Asexual Sexual
Number of parent cells involved
Genetic outcome of offspring
How many offspring produced?
How fast are offspring produced?
Main mode of reproduction for organisms like…

24. 2 final questions…
If a population needed to adapt to a changing environment by taking advantage of a diverse gene pool, which mode of reproduction would be most useful/advantageous [sexual or asexual] Why?
If a population needed to spread out and colonize a large area very quickly, which type of reproduction would be most advantageous?