How do cells make new cells

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Aim: How do cells make new cells?

Do Now: What happens when you cut a 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?

Homework: Read Text Book pages 284-287. Answer questions 4, 5, 6 and 7on page 287

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What is reproduction?

Reproduction is the process by which

organisms produce more of their own kind.

Think about it – Without reproduction, all

life on earth would no longer exist.

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What is Asexual Reproduction?

Only one parent is involved.

Offspring are genetically identical to their parents.

All cells that come from a single cell are genetically identical to it and to each other; they are all clones.

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Types of Asexual Reproduction

Mitosis - is the exact duplication of the nucleus of a cell so as to form two identical nuclei during cell division.

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Types of Asexual Reproduction

2. Binary Fission - occurs in one-celled organisms such as the ameba and paramecium. The nucleus divides by mitosis and the cytoplasm divides, forming 2 new daughter cells of equal size.

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Types of Asexual Reproduction

3. Budding - Occurs in Hydra and yeast. The division of cytoplasm is unequal so one of the daughter cells is larger than the other. The daughter cells can separate or remain attached.

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Types of Asexual Reproduction

4. Sporulation - occurs in molds, mosses, etc

Spores are produced in large numbers by mitosis.

Spores are surrounded by a tough coat to help them survive harsh environmental conditions.

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Types of Asexual Reproduction

5.Regeneration - Refers to the replacement or regrowth of lost or damaged body parts

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Types of Asexual Reproduction

6.Vegetative Propagation –

Occurs only in plants (vegetative). New plants develop from the roots, stems, or leaves of the parent plant.