mitosis lesson 2
TRANSCRIPT
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CURIOSITY is the KEY to CREATIVITY
Needs are never the
key to creativity
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Creativity is not artistic, but
PROBLEM SOLVER
E.g.: Apple Inc CEO,
Steve Job
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When you stop to ask questions, you stop growing
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Study is not about exam, but the excitement when you learn
something new
Rebecca Choong, 2010
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Cells in living things do not last forever, for they…
• Wear out after some time• Get damaged (through cuts, by ultraviolet
radiation or by hazardous environmental pollutants)
• Grow old naturally and die
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Importance of new cells produced are genetically identical to their parent cells:
• Continue with the specific cell functions of their parent cells within a particular tissue
• Avoid disrupting the stable internal environment of life or its processes
• Produce offspring that have the complete functions of an adult organism (in asexual reproduction) to ensure the survival of that species
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Significance of mitosis
• Nucleus contains chromosomes.• Each chromosome consists of a long DNA
molecule which carries genes in a linear sequence
• Gene determines the individual characteristics of an organism
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Significance of mitosis
• The characteristic number of chromosomes is referred to as the chromosomal number of the species
• Exp: Onion cell – 16 chromosomes• Exp: Fruit fly - 8 chromosomes
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Significance of mitosis
• Somatic cells have two sets of chromosomes, one set inherited from each parent.
• Each cell contains a diploid number of chromosomes (2n)
• In humans, each set consist of 23 chromosomes.
• Typical human somatic cell, 46 chromosomes arranged in 23 pairs or 2n = 46
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Significance of mitosis• The two
chromosomes in each pair have the same structural features and are referred to as homologous chromosomes
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Significance of mitosis
• Gametes contain only one set of unpaired chromosomes, or haploid number of chromosomes (n)
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Cell Cycle
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Uncontrolled Mitosis in Living Things
• Cancer• Cancerous cell - tumour
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Application of mitosis
• Cloning
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Application of mitosis
• Tissue culture