1. Sexual vs. Asexual Reproduction
Ms. Porter 7th Grade Science

2. GOAL To compare forms of sexual and asexual reproduction
To understand the process of mitosis

3. Why do living things reproduce?
Your thoughts??

4. Do all living things reproduce in the same way?
Your thoughts??

5. Purpose of Reproduction
To make sure a species can continue.
Definition: Reproduction is the process by which an organism produces others of its same kind.

6. Sexual Reproduction Sexual Reproduction
1. ALWAYS TWO sex cells: sperm and egg
2. Sperm and egg join= fertilization
3. Offspring look different from parent (mixed DNA)

7. Sexual Reproduction Sexual Reproduction 5. Examples
Humans, some flowering plants, mammals, fish, reptiles, etc.

8. Sexual Reproduction

9. Asexual Reproduction
A new organism (sometimes more than one) is produced from one organism.
The offspring will have hereditary material uniform with the hereditary material of the parent organism. This means they will be genetically alike.

10. Asexual Reproduction Asexual Reproduction 1. One parent
2. No sex cells
3. Offspring produced by cell division (MITOSIS)
4. Offspring identical to parent (exact same DNA)
5. Several types in plants and animals

11. Types of Asexual Reproduction
Fission (Binary fission)
Budding
Regeneration

12. Fission Also called binary fission.
Becoming two by division of the complete organism.
A type of cell division.

13. Types of Asexual Reproduction
1. Organism divides in half
2. 2 identical daughter cells produced
3. Daughter cells are half the parent’s size
4. Daughter cells grow, then divide too
5. In bacteria
Binary Fission

16. Budding
Process by which a new, duplicate plant or animal begins to form at the side of the parent and enlarges until an individual is created.
Very common in plants;

17. Types of Asexual Reproduction
Budding
1. Small bud grows out of parent cell
2. Two different sized cells made (with identical DNA)
3. Bud breaks off and grows
4. In yeast and hydra

20. Regeneration
The ability to restore lost or damaged tissues, organs or limbs.
It is a common feature in invertebrates, like worms and starfish.

21. Types of Asexual Reproduction
Regeneration
1. Repair/ grow lost body parts
2. Left over cells divide to make more cells
3. Lobsters, starfish, lizards

23. IMPORTANT!
Asexual reproduction results in offspring that are genetically identical to the parent organism
Sexual reproduction results in offspring that are genetically different from the parent organisms

24. I. Asexual Reproduction
Advantages
Disadvantages
Requires only one parent
All offspring genetically identical
Can populate an area efficiently
If the environment becomes hostile all are at risk

25. II. Sexual Reproduction
Advantages
Disadvantages
Genetic information is shared in sexual reproduction = variety is produced in the species
A species with a lot of variation is much less susceptible to any one kind of attack (i.e.… disease, parasites etc…)
Organisms have to expend energy in the synthesis of sex organs, finding a mate, courtship, and mating.
Much slower
Less efficient

26. What type of reproduction is this??? Explain…

27. What type of reproduction is this??? Explain…

28. What type of reproduction is this??? Explain…

29. What type of reproduction is this??? Explain…

30. What type of reproduction is this??? Explain…

31. What type of reproduction is this??? Explain…

32. What type of reproduction is this??? Explain…

33. What type of reproduction is this??? Explain…

34. What type of reproduction is this??? Explain…

35. What type of reproduction is this??? Explain…

36. What type of reproduction is this??? Explain…

37. What type of reproduction is this??? Explain…

38. What type of reproduction is this??? Explain…