warm-up: oct. 5 use your notes and/or textbook and add new info. to your essential vocabulary terms:...
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Warm-up: Oct. 5
Use your notes and/or textbook and add NEW INFO. To your essential vocabulary terms:
Chromosome
Mitosis
Diploid
Meiosis
Haploid
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Asexual vs. Sexual Reproduction
Disadvantages, Advantages, and Types
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Asexual Reproduction
What is it?
Production of individuals WITHOUT gametes
Result is a GENETICALLY IDENTICAL offspring, same chromosome number.
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Why Asexual Reproduction?Benefits
Need one individual to reproduce
Takes less energy
All offspring are genetically identical which is “good” if environment is stable, No Dramatic changes
Everybody is producing offspring including males
More efficient at passing genes, faster
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Why NOT asexual reproduction?Consequences:
Organisms are Genetically identical, Clones
No recombination or exchange of genes between parents
An asexual population tends to be genetically boring, EVERYBODY IS THE SAME.
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Types of Asexual Reproduction
1. Binary Fission- a one-celled organism divides by mitosis to form two daughter cells of equal size. Organisms: Bacteria and Protist
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Types of Asexual Reproduction
2. Vegetative Propagation- a part of a plant (a root, stem, or leaf) grows into a new plant. Organism: Plants and Fungi
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Types of Asexual Reproduction
3. Spore Formation- spores are specialized asexual reproductive cells that contain an entire set of DNA and a small amount of cytoplasm. Each spore can develop into a new organism.
Organisms: Some Plants, Fungi, and Bacteria
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Types of Asexual Reproduction
4. Budding- a new organism develops as an outgrowth of the parent.
Organisms: Animals (Hydra and Sponges) and Fungi
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Types of Asexual Reproduction
5. Regeneration- is the development of a new organism from a part of the parent organism.
Organism: Some Animals (Hydra, Sea Stars, and Flat Worms)
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Sexual Reproduction
Production of individuals with gametes Combining of DNA
Meiosis produces the Gametes for Fertilization (Conjugation) in Animals Pollination in Plants
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Advantages to Sexual Reproduction
1. Offspring are genetically unique due to crossing over and random combination of gametes.
2. Favourable when environment is unstable, dramatic change occurs.
3. Slower rate of reproduction but faster when evolving (changing overtime)
4. Lower extinction rates
5. Due to parents exchanging genes, there is a fast removal of bad mutations or can put two beneficial mutations together
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Disadvantages to Sexual Reproduction
1. Need two parents, so they “must expend energy” to find, identify (court), and copulate with mate
2. Taking the time to exchange genes is counter productive if conditions are stable
3. Only half the individuals are producing offspring-(Males are an energy issue)
4. Slower at passing on genes
5. “Cost of recombination or exchanging genes ”-a favourable combination of genes can be broken
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Warm-up: Oct. 8, 2012
Get out your common assessment 3 review guide.
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Animal Cell
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Organelle Function
Mitochondrion: Produces ATP for the Cell, Cell Respiration
Ribosome: Protein Synthesis
Nucleolus: Makes Ribosomes
Nucleus: Holds the DNA, Control Center of the Cell
Vacuole: Used for Storage of Water (Large in Plants)
Chloroplast: Photosynthesis, Plants make their own food.
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Cell Membrane
Regulates what goes in and out of the Cell
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Plant vs. Animal cell
Plant Cell Animal Cell
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Prokaryotic vs. Eukaryotic
Prokaryotic Eukaryotic
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Cell Membrane
Regulates what goes in and out of the Cell
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Passive Transport
From High to Low, You Go with the Flow.
The Cell Uses NO ENERGY
Diffusion: Movement of small molecules from High to Low Concentration
Facilitated Diffusion: Movement of LARGE molecules from High to Low Concentration through a transport protein
Osmosis: Movement of WATER from High to Low Concentration
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Active Transport
From Low to High; You must BUY!
The Cell uses ENERGY!
Endocytosis Exocytosis
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The Cell Cycle
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The Cell Cycle
Interphase: G1: Growth
S(ynthesis): DNA replication
G2: Growth and Extra Organelles are made (Getting Ready for Mitosis)
Prophase: Chromosomes Appear, Centriole move to
opposite ends, Nuclear Membrane disappears
Metaphase: Chromosomes in the Middle
Anaphase: Chromosomes pulled Apart
Telophase: Two Nuclei
Cytokinesis: Cytoplasm Splits
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Cytokinesis in Plant Cells
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Meiosis
Meiosis I Interphase→ Cell Growth & DNA Replication
Prophase I
Metaphase I
Anaphase I
Telophase I & Cytokinesis→ 2 Cells
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Meiosis
Meiosis II Interphase II→ Growth
Prophase II
Metaphase II
Anaphase II
Telophase II & Cytokinesis: 4 Haploid Cells
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Mitosis vs Meiosis
Mitosis
Somatic Cells/ Body Cells
1 Division
2 Daughter Cells
Daughter Cells: Diploid
Daughter Cells: Identical
Asexual Reproduction
Meiosis
Sex Cells/ Gametes/ Reproductive Cells/ Germ Cells
2 Divisions
Daughter Cells: Haploid
Daughter Cells: Genetically Different/Genetic Variation
Sexual Reproduction
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Human Cells
Human Body Cells: 46 chromosomes
Human Sex Cells: 23 Chromosomes