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Reproduction.

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Presentation on theme: "Reproduction."— Presentation transcript:

1 Reproduction

2 Reproduction Reproduction –The natural process among organisms by which new individuals are generated and the species continues to survive Necessary because no individual organism lives forever

3 Sexual reproduction 2 parents
Sperm cell and egg cell combine through fertilization Offspring has genetic material from both parents Traits from both parents

4 Sexual Reproduction Most multicellular organisms reproduce sexually
Humans Birds Turtles Flowers

5 Asexual Reproduction Only one parent
Organism multiplies without seeds, sex cells, or fertilization Exact copy of the parent Types of Asexual Reproduction: Budding Binary Fission Regeneration Self-pollination Vegetative Reproduction

6 Examples of asexual Reproduction
Yeast (Budding) Buds form on a parent yeast then break off to form new yeasts Starfish (Regenration) An arm breaks off and a new one grows back

7 Example of Asexual Reproduction
Strawberry plants (vegitative reproduction) Parent plant sends out a runner and new plants are cloned in cells from parent plant

8 Example of Asexual Reproduction
Peanut Plant (Self-Pollination) Male and female parts of a plant of a single plant work together to make an offspring Amoeba (Binary Fission) Splits into 2 new amoeba

9 Both Some organisms can reproduce sexually and asexually
Ex: mushroom, jellyfish, sponge, cactus, daffodil

10 Advantages of Sexual Reproduction
Mutations and defects can be stopped from affecting future generations Genetic Variation More variation = better able to deal with change and survive

11 Disadvantages of Sexual Reproduction
If environment does not change then variation may hurt a species 2 sex cells are needed (2 parents) Offspring produces more slowly Hard for some organisms to find a mate Mutations may occur Very few offspring produced at a time

12 Disadvantages of Asexual Reproduction
May die off if environment changes If there is a disease or mutation in a plant it will be passed to all offspring Some methods of asexual reproduction produce offspring that are close together and compete for food and space. 

13 Advantages of Asexual Reproduction
Organism thrives if environment is unchanging Only one parent needed (reproduce quickly) Large numbers of offspring are reproduced very quickly Large number of organisms mean that species may survive when conditions or the number of predators change. 


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