5.2 Asexual Reproduction A clone is an identical genetic copy of its parent. Many organisms naturally form clones via asexual reproduction. Cloning is.

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Presentation transcript:

5.2 Asexual Reproduction A clone is an identical genetic copy of its parent. Many organisms naturally form clones via asexual reproduction. Cloning is also used in agriculture and research to copy desired organisms, tissues and genes.

Types of Asexual Reproduction 1. BINARY FISION When a single celled organism (ex. amoeba, paramecium) splits into identical copies through the process of mitosis.

Types of Asexual Reproduction 2. BUDDING When areas of some multicellular organisms (ex. hydra, sponge) undergo repeated mitosis to form an identical organism. Buds sometimes detach to form a separate organism.

Types of Asexual Reproduction 3. FRAGMENTATION When a part of an organism breaks off due to injury, and the part grows into a clone of the parent.

Types of Asexual Reproduction 4. VEGETATIVE REPRODCUTION When parent plants grow new plants which remain attached for a time and may break off to form new adult plants.

Types of Asexual Reproduction 5. SPORE FORMATION When some bacteria, micro-organisms and fungi can form spores - single cells that can grow into a whole new organism.

Advantages & Disadvantages

Human Assisted Cloning Humans use all the asexual cloning methods in order to produce desired results with organisms. This is done in several ways.

Human Assisted Cloning Reproductive cloning - purpose is to produce a genetic duplicate of an existing or dead organism. Steps involved: Remove nucleus from an egg cell A mammary gland cell is removed from an adult female Electricity fuses mammary and egg cell Fused cell begins dividing Dividing embryo is inserted into surrogate mother

Human Assisted Cloning Therapeutic cloning - purpose is to correct health problems Very important to therapeutic cloning are stem cells - cells that can become different types of cells Stem cells can be used to replace cells damaged from injuries or disease Diabetes, spinal injuries, Parkinson’s disease are only a few that can benefit from stem cell therapy Controversial because the best stem cells are from embryos which are destroyed when harvesting cells

Human Assisted Cloning Section 5.2 Quiz