largest:ostrich egg smallest: red blood cell longest: nerve cell
TRANSCRIPT
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8.2 CELL REPRODUCTION AND GROWTH
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ALL ORGANISMS COME FROM ONE CELL
Largest: Ostrich Egg Smallest: Red Blood Cell Longest: Nerve Cell
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WHERE DO CELLS COME FROM?
Another cell: Asexual Reproduction Exact copy of the cell
A combination of cells: Sexual Reproduction Male and Female sex cells combine Genes of both parents determine traits
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CELL SIZE LIMITATIONS
Enough surface area to let materials in and out Diffusion takes time to reach all organelles In: water, glucose, oxygen Out: water, urea, carbon dioxide
Function: Depends on the type of cell Ex: nerves (long), RBCs (small)
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WHEN DO CELLS DIVIDE?
Some divide faster than others Skin cells: 25 million/sec. (created and
destroyed) Bones? Nerves?
Growing: more created than destroyed Repair: Getting cut (bleeding), bruises, sick
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ROLE OF CHROMOSOMES
Chromatin coils into chromosomes during cell division (mitosis)
Chromosomes carry the genetic info. (DNA) DNA Chromatin Chromosomes
Humans have 46 chromosomes Do our cells reproduce sexually or asexually?
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CELL CYCLE
Sequence of growth and division of a
cell
Interphase – growth phase
Mitosis- division phase
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INTERPHASE
3 parts:
Growth in size
DNA Synthesis- copies its genetic material
Growth period- prepares for division (protein)
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MITOSIS- 4 PHASES
Cell division is continuous (phases blend)
PMAT
Prophase
Metaphase
Anaphase
Telophase
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PROPHASE
First and longest phase of division
Chromatin coils into chromosomes
Sister chromatid (exact copies of a chromosome) attached by a centromere
Nuclear envelope disintegrates
Centrioles migrate (animal)/ spindle forms
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METAPHASE
Second and shortest phase
Chromosomes align on the metaphase
plate
Spindle fibers attach to each sister
chromatid
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ANAPHASE
Third phase
Spindle fibers pull sister chromatid
apart
Chromatid are now chromosomes
Centromere breaks apart
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TELOPHASE
Final division phase
Chromosomes reach opposite ends of
the cell
Spindle breaks down /chromosomes
uncoil
Nuclear envelope forms around
chromosomes
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CYTOKINESIS
Division of the Cytoplasm Plants
form a cell plate cell wall Animals
cleavage furrow- plasma membrane pinches
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RESULTS OF MITOSIS
Two identical nuclei cells
Unicellular- remain as single cells
Multicellular- groups of cells working together Tissue Organ Organ System Organism
Review
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8.3 CONTROL OF CELL CYCLE
Enzymes promote or inhibit cell division Directed by genes (growth hormone)
Gene- segment of DNA controlling protein production Eye color (controls protein for blue or
brown) Skin color (controls level of melanin)
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CONTACT INHIBITION
When cells touch, they stop dividing
Form a layer, not a pile of cells
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CANCER
Uncontrolled division of cells
Tumors: Malignant (cancerous) Benign (stops growing)
Metastasis- spreading of cancer through body Examples
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CAUSES OF CANCER
Genetic Runs in the family
Environmental Smoke, pollution, radiation
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TYPES OF CANCER
Carcinomas
internal or external coverings
Sarcomas- bone or muscle
Leukemia- blood or bone marrow
Lymphomas
spleen and lymph nodes
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REPLACEMENT SKIN