Presentation on theme: "2 sister chromatids Chromosomes OR Chromatids ReplicationAnaphase 1 Chromosome Interphase 2 identical Chromosome 2 identical chromatids One in each daughter."— Presentation transcript:
2 sister chromatids Chromosomes OR Chromatids ReplicationAnaphase 1 Chromosome Interphase 2 identical Chromosome 2 identical chromatids One in each daughter cell. Prophase
InterphaseProphaseMetaphase Parent cell Visible but not organized Chromosomes lining up AnaphaseTelophaseInterphase Pulling apartCell dividingTwo identical cells
Reproduction and Cell Division The modern cell theory states that All living things are made of one or more cells The cell is the functional unit of life All cells come from preexisting cells There are 2 types of organism reproduction Asexual and Sexual
Differentiate among the various methods of asexual reproduction Identify the different types of asexual reproduction KEY WORDS Asexual Reproduction Binary Fission BuddingSporulation RegenerateVegetative propagation
Asexual Reproduction Cell duplication using mitosis* and cytokinesis Produces genetically identical cells. 1.Cells are “clones” - exact copy of original. 2. Rapid and effective method of reproduction. 3. No cellular diversity.
Bacteria: Single-cell organisms (Unicellular). Do not have a true nucleus. Asexual reproduction called binary fission. Example - E. coli (Escherichia Coli) - organism splits into two equal sized cells each with chromosome of complete DNA.
Animals Split into two big groups: Vertebrates (with backbones) Invertebrates (without backbones) Invertebrates will usually reproduce asexually. Fragmentation – ability of an animal to regenerate (regrow) parts of the body. The simpler the animal, the greater the ability to regenerate.
Asexual reproduction - advantages. Easy to reproduce – even if you can’t move (stationary). No need to find a partner. Each cell will look and function the same – no variation. Asexual reproduction - disadvantages. Can lead to overcrowding (and competition). One disease can wipe out a whole species – no variation. No possibility for adaptation and evolution.