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Unit 3 Notes: Reproduction & Meiosis
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(1) Types of Reproduction
Asexual Sexual Growth & Reproduction Reproduction One Parent Two Parents Rapid Reproduction Rate Slower Reproduction Rate Offspring identical copy of Parent Offspring a mixture of genes from Parents
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(2) Binary Fission: Type of Asexual Reproduction.
Unicellular Organisms: Parent splits in 2 Daughter cells identical Purpose: Growth & Reproduction
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(3) Antibiotic Resistance:
Bacterial DNA: DNA = regular cell instructions Plasmid = extra circular DNA Bacterial Conjugation: Exchange of DNA + Plasmid between 2 bacterial cells Allows cells to pass on resistance Antibiotics: Kill all bacteria not resistant Any which are survive Make copies of selves (Binary Fission) Exchange benefits (Conjugation)
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(4) Budding: Type of Asexual Repro.
Organism develops tiny buds on body/cell Bud = Offspring / Daughter cell Bud detaches Grows into adult
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(5) Multicellular Life Cycle:
1. Meiosis Make Sex Cells 2. Fertilization Sperm + Egg 3. Zygote Fertilized Egg (Developing Organism) 4. Mitosis Grow, Develop & Repair new organism!
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(6) Meiosis Summary: Meiosis is used to make more sex cells (called Gametes or Sperm/Egg Cells). Meiosis happens in stages like mitosis. Meiosis divides twice: Meiosis 1 Start with 1 cell, end with 2 cells Start 2n, end 2n (or Diploid Diploid) Meiosis 2 Start with 2 cells, end with 4 completely unique cells Start 2n, end 1n (or Diploid Haploid)
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