bi32 - Aim: How do cells make new cells? Aim: Do Now: What...

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Unformatted text preview: Aim: How do cells make new cells? Aim: Do Now: What happens when you cut a Do worm in half? Why do you think you can grow new skin over a cut on you hand but you can’t grow new fingers? you Homework: Read Text Book pages 284287. Answer questions 4, 5, 6 and 7on 287. page 287 page What is reproduction? What Reproduction is the process by which Reproduction organisms produce more of their own kind. organisms Think about it – Without reproduction, all life on earth would no longer exist. What is Asexual Reproduction? What Only one parent is involved. Offspring are genetically identical to their Offspring parents. parents. All cells that come from a single cell are All genetically identical to it and to each other; they are all clones. other; Types of Asexual Reproduction Types 1. Mitosis - is the exact duplication of the nucleus of a cell so as to form two identical nuclei during cell division. division. Types of Asexual Reproduction 2. Binary Fission ­ occurs in one­celled organisms such as the ameba and paramecium. The nucleus divides by mitosis and the cytoplasm divides, forming 2 new daughter cells of equal size. Types of Asexual Reproduction Types 3. Budding - Occurs in Hydra and yeast. The 3. Budding division of cytoplasm is unequal so one of the daughter cells is larger than the other. The daughter cells can separate or remain attached. attached. Types of Asexual Reproduction Types 4. Sporulation - occurs 4. Sporulation in molds, mosses, etc in Spores are produced Spores in large numbers by mitosis. mitosis. Spores are Spores surrounded by a tough coat to help them survive harsh environmental conditions. conditions. Types of Asexual Reproduction Types 5.Regeneration Refers to the replacement or regrowth of lost or damaged body parts body Types of Asexual Reproduction Types 6.Vegetative Vegetative Propagation – Propagation Occurs only in plants (vegetative). New plants develop from the roots, stems, or leaves of the parent plant. parent ...
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