1. REPRODUCTION 2 Kinds of Reproduction Asexual -- One parent Sexual --
Two parents
Specifically--
Sperm and Egg

2. Chromosomes and Cell Division
Chromosomes – Structures in a cell’s nucleus that contain genes.
Genes – Found on chromosome in cell. Gives living thing a certain
trait and tells a cell how to grow/develop.

3. How do all forms of asexual reproduction end in an organism?
Through the process of
MITOSIS!
( Form of reproduction requiring only one parent.)

4. Cell Division/MITOSIS!!
Interphase I
Painted
Prophase My
Metaphase
MITOSIS
Aunt’s
Anaphase
Telophase
Toes
Crimson!
Cytokinesis
Actual “Cell Division” only happens in phases 2-5!

5. Cell Division — 6 phases Mitosis — 4 phases
1. Interphase—normal life functions
Toward the end—chromosomes
duplicate
Humans- 46
Once duplicated- 92
Sister chromatids held together-
centromere
2. Prophase--
Mitosis begins
Nuclear membrane breaks down
Centrioles begin to move &
Spindle forms between
3. Metaphase-
Centromeres line up in the MIDDLE
4. Anaphase--
Centromeres split—move to opposite sides

6. 5. Telophase- Mitosis is complete Cytoplasm divides 6. Cytokinesis-
Nuclear membrane appears
Cytoplasm divides
6. Cytokinesis-
End result==2 NEW DAUGHTER CELLS
Exactly like the parent cell!!
Is this a problem?? Why?

7. 23 23 Gamete Gamete 46 egg ZYGOTE
Sexual Reproduction – Production of new organism from 2 parents , a male and a female.
Sex Cell – Cell that has half the number of chromosomes found in
an organism’s body cells. An egg or a sperm.
sperm 23 23
egg
chromosomes
chromosomes
Gamete
Gamete 46
chromosomes
ZYGOTE
- New person not exactly like each parent.
2 complete cells join, new baby has twice the chromosomes as each parent.

8. Meiosis (Process that produces sex cells with ½ number of chromosomes of parent cell.)
Sperm or Egg Cells
(Gametes) 46 24 23
46 chromosomes 23 46 23
Sperm or Egg Cell 23

9. Let’s watch meiosis in action!

10. Advantages/Disadvantages of Asexual/Sexual Reproduction
Asexual Reproduction
Sexual Reproduction
Organism does not
need a mate to
produce offspring.
Advantage
Advantage
Gives species
variation.
Disadvantage
Offspring exactly
like parents.
Disadvantage
2 parents needed
for reproduction.

11. Species (Group of similar organisms that can mate with one another and produce fertile offspring.)

12. Why mitosis and meiosis?

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