Unit 3 Notes: Reproduction & Meiosis

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Presentation transcript:

Unit 3 Notes: Reproduction & Meiosis

(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

(2) Binary Fission: Type of Asexual Reproduction. Unicellular Organisms: Parent splits in 2  Daughter cells identical Purpose: Growth & Reproduction

(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)

(4) Budding: Type of Asexual Repro. Organism develops tiny buds on body/cell Bud = Offspring / Daughter cell Bud detaches  Grows into adult

(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!

(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)