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Asexual Reproduction

Asexual Reproduction . Advantages and Disadvantages. Binary Fission. Bacteria reproduce by a process called binary fission

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Asexual Reproduction

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  1. Asexual Reproduction Advantages and Disadvantages

  2. Binary Fission • Bacteria reproduce by a process called binary fission • Binary fission: a copy of their single chromosome is produced and then the cell divides in half so that one half gets one chromosome and the other half gets the other chromosome • Because the chromosome was duplicated, each new cell receives a complete set of hereditary information

  3. Asexual Reproduction • Binary fission is an example of asexual reproduction in single celled organisms • Multi-cellular organisms that reproduction asexually is more complex and occurs in the nucleus through mitosis. • Only types of asexual reproduction are: • Budding • Fragmentation • Gemmules (Internal Buds) • Regeneration

  4. Budding • Offspring grows out of the body of the parent • Hydras exhibit this type of reproduction • Jellyfish also • reproduce through • budding

  5. Sponges • Sponges reproduce asexually through gemmules (internal buds) • A parent releases a specialized mass of cells that can develop into an offspring

  6. Fragmentation • In this form of asexual reproduction, the body of the parent breaks into distinct pieces, each of which can produce an offspring. • Molds, yeast and some mushrooms reproduce in this way.

  7. Regeneration • If a piece of a parent is detached, it can grow and develop into a completely new individual. • Flatworms use this type of asexual reproduction.

  8. Mitosis • In a complex cell going through asexual reproduction, the nucleus divides during a process called mitosis. • Mitosis ensures that each new cell received the same number and kinds of chromosomes that were present in the parent cell. • In both binary fission/mitosis, these processes produce two offspring with hereditary information that is identical to the parent cell.

  9. Mitosis

  10. Advantages and Disadvantages of Asexual Reproduction • Advantage: an organism does not have to wait for a partner to be able to produce offspring. • Disadvantage: the offspring are exactly like the parents (no variation in DNA). • Asexual reproduction does not allow organisms to have variation from generation to generation. (could cause an organism to die out if changes occur in ecosystem)

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