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Reproduction

Reproduction. Asexual and Sexual. A ll Living Things……. Are made of cells, Require energy, G row and develop, R espond to their surroundings (stimulus/response) Display organization Maintain homeostasis Adapt and evolve over time REPRODUCE!!!. Thinking Points.

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Reproduction

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  1. Reproduction Asexual and Sexual

  2. All Living Things…… • Are made of cells, • Require energy, • Grow and develop, • Respond to their surroundings (stimulus/response) • Display organization • Maintain homeostasis • Adapt and evolve over time • REPRODUCE!!!

  3. Thinking Points • What is the result of reproduction? • Why do organisms bother to reproduce? Why don't they just live forever? • What would eventually happen to a species if every member suddenly lost its ability to reproduce?

  4. Reproduction=making babies!

  5. Two Types of Reproduction • Asexual reproduction - production of genetically identical offspring from a single parent. • Sexual reproduction - production of genetically different offspring from two parents.

  6. Review: Whatdoes this word “genetic” mean anyway? DNA DNA is an instruction manual for an organism

  7. Asexual Reproduction5 Types You Need to Know • Binary Fission • Vegetative reproduction • Budding • Spore formation • Regeneration BRAIN POP!

  8. Binary Fission Prokaryotic cells divide into 2 genetically identical cells

  9. Vegetative Reproduction Production of a new plant from a portion of another plant, such as a stem or branch. Also called vegetative propagation.

  10. Budding Budding is the process of a parent organism pinching off to form a new organism genetically identical to the parent.

  11. Spore Formation Spores are released from parent to produce genetically identical offspring. (Bacteria, plants, algae, and fungi.)

  12. Regeneration The ability to replace or regrow missing body parts

  13. Is a form of Sexual Reproduction

  14. Disadvantages • Asexual – no genetic variation (less genetic diversity among the species) so less chance for survival if environment should change • Sexual – • takes longer to make offspring, • requires two parents, • can’t reproduce as often in a single lifetime

  15. Advantages • Asexual • Requires only one parent • Organisms can reproduce rapidly • Requires less metabolic energy • No special sex organs necessary • Low genetic variability allows a higher success rate AS LONG AS THE ENVIRONMENT DOESN’T CHANGE.

  16. Advantages • Sexual – • Because DNA from two parents is combined, lots of genetic diversity • Organisms reproduce less frequently • Genetic variation allows better chance for survival if environmental conditions should change • Genetic variation can lead to resistance to certain types of disease • Genetic variation enables evolution within a population

  17. Who does it? • Asexual – organisms from the archaebacteria, eubacteria, and Protista kingdoms, some fungi, some plants, and some simple animals • Sexual – most animals and plants, some protists, some fungi, humans, some prokaryotes (conjugation).

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