Aim: How do cells make new cells?Aim: How do cells make new cells?

Do Now: What happens when you cut a Do Now: What happens when you cut a worm in half? Why do you think you can worm in half? Why do you think you can grow new skin over a cut on you hand but grow new skin over a cut on you hand but you can’t grow new fingers?you can’t grow new fingers?

Homework: Read Text Book pages 284-287. Homework: Read Text Book pages 284-287. Answer questions 4, 5, 6 and 7on page Answer questions 4, 5, 6 and 7on page 287287

What is reproduction?What is reproduction?

Reproduction is the process by which Reproduction is the process by which

organisms produce more of their own kind.organisms produce more of their own kind.

Think about it – Without reproduction, all Think about it – Without reproduction, all

life on earth would no longer exist. life on earth would no longer exist.

What is Asexual Reproduction?What is Asexual Reproduction?

Only one parent is involved.Only one parent is involved. Offspring are genetically identical to their Offspring are genetically identical to their

parents.parents. All cells that come from a single cell are All cells that come from a single cell are

genetically identical to it and to each other; genetically identical to it and to each other; they are all clones.they are all clones.

Types of Asexual ReproductionTypes of Asexual Reproduction

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

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.

Types of Asexual ReproductionTypes of Asexual Reproduction

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

Types of Asexual ReproductionTypes of Asexual Reproduction

4. 4. SporulationSporulation - occurs - occurs in molds, mosses, etcin molds, mosses, etc

Spores are produced Spores are produced in large numbers by in large numbers by mitosis.mitosis.

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

Types of Asexual ReproductionTypes of Asexual Reproduction

5.5.RegenerationRegeneration - - Refers to the Refers to the replacement or replacement or regrowth of lost regrowth of lost or damaged or damaged body partsbody parts

Types of Asexual ReproductionTypes of Asexual Reproduction

6.6.Vegetative Vegetative PropagationPropagation – –

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

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