1. Types of Reproduction
Chapter 3.3

2. Reproduction
The passing of genes from a parent generation onto their offspring
Passing on genes ensures the continuation of a species
Without reproduction, a species will go extinct
2 Types
Asexual
Sexual

3. Asexual Reproduction Requires only one parent
Offspring have 100% the same chromosomes as the parent
Offspring are “clones”
No new variation of traits
Most common in unicellular organisms
Cells make copies of themselves
Mitosis

4. Examples of Asexual Reproduction
Binary Fission
Budding
Fragmentation/Regeneration

5. Binary Fission Occurs in prokaryotes Reproduction by dividing in half
Bacteria

6. Budding Both unicellular and multicellular
Offspring grows off the body of the parent
Parent produces tiny buds
When a bud reaches a certain size, it breaks free of the parent
Yeast, Hydra, cactus

7. Fragmentation/Regeneration
Multicellular organisms
Parent breaks into pieces which become the offspring
Starfish, corals, plant cuttings

8. Asexual Reproduction and Health
Generation time of many bacteria is very short
The time it takes for one generation to produce offspring (the next generation)
Some types of bacteria can produce a new generation in less than 30 minutes!

9. Sexual Reproduction Two different parents
Requires production of special sex cells called gametes
produced through meiosis
Egg (Ovum) cells
Sperm cells
Fertilization is when egg and sperm combine
Egg + Sperm = Zygote (First cells of a new organism)

10. Sexual Reproduction
Most multicellular organisms undergo sexual reproduction
Provides genetic variation (offspring are genetically different from their parents)
Each gamete has different combination of parent’s genes
Fertilization brings together separate genetic material of 2 different parents

11. Summary
Asexual Reproduction
Sexual Reproduction

12. Summary Asexual Reproduction Sexual Reproduction A. No mixing of genes
only _________ parent.
A. Mixing of genes from _________ parents
B. Offspring are ____________________ to the parent— called clones
B. Offspring are genetically______________________ , but not __________________________ to either parent
Best form of reproduction in a ______________________________ environment
There is little need for genetic diversity in the population because organisms are well suited to their environment.
C. Advantageous in a ___________________________________ environment
There is need for more genetic diversity so some individuals are likely to survive an environmental change.
D. Typical in most __________________________ organisms and some multicellular like hydra, jellyfish, some
plants
D. Most ____________________________ organisms

13. Investigating Reproductive Strategies
Your group will be split in two. One half will investigate asexual reproduction and the other half sexual reproduction.
Travel to all 3 organisms stations for your type of reproduction.
Then, groups will reconvene and share information.

14. Investigating Reproductive Strategies
Travel to the last stations you need to complete.
Original table groups will reconvene. Share information so all members have info for both asexual and sexual reproduction.