unit 2 biology

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  • Created by: amy
  • Created on: 09-05-13 16:44
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  • Unit 2 Biology
    • Variation
      • Genetic  Variation
        • Variation due to Genes
          • E.G. Blood type
      • Environmental Variation
        • Variation due to lifestyles and environment
          • E.G. height
      • Standard deviation
        • the equation used to measure the range of values
          • Square root of the sum of value from sample minus mean squared divide by number of vaules
    • DNA and Meiosis
      • The Triplet code
        • a code containing 3 bases
          • which codes for 1 amino acid
      • Structure of DNA
        • deoxy-ribose
        • phosphate
        • organic base
          • Double ring A,G
          • single ring C,T
      • DNA and chromsomes
        • Homologous chrosomes
          • chromsomes  that determine the same genes
        • Alleles
          • one form of a gene
      • Meiosis and Gentic variation
        • crossing over
          • when genes  swap cromatids
        • Independent segregation
          • when the chromatids organise them selves in a radom order
    • Genetic Diversity
      • selective breeding
        • breeding sele cted animals for desired traits
          • E.G. beef cows
      • the founder effect
        • when a small population is made from a existing one
          • giving the new population specifc genes
      • Gentic bottlenecks
        • when a species suffer large lose in numbers
          • leaving only specifc genes E.G. elephant seals
    • The Variety of Life
      • Heamglobin
        • takes oxygen aorund the body
        • can have hig or low afinty
      • Oxygen disociation Curve
        • shows factors effecting oxygen uptake
      • Starch , glycogen and cellulose
        • starch and glycogen storage and cellulose in plant structures
      • plant cell structure
        • move chloroplast near surface to adsorb sunlight
    • The Cell Cycle
      • replication of DNA
        • semi consevative
          • uses one strand from old DNA
          • DNA Helicase and ployimerase
      • mitosis
        • the normal division of cells
          • interphase,prophase ,metaphase,anaphase ,telophase and cytokynesis
      • cell cycle
        • the way the cells divide change in this can detect cancer
    • Cellular Organisation
      • celll differentiation
        • looking at different tissue and systems
          • E.G. organ systems and tissue types
    • Exchange and Transport
      • transpiration
        • factors  are light ,temperature,humidity ,
      • exchange systems
        • use pump to move blood
        • s.a to vol ratio not used
      • exchange in insects and fish
        • use gills and spircales
    • Classifcation
      • naming
        • kingdom,phylum,class,order,family,genus,species
    • Evidence for Relationships Between Organisms
      • DNA  Comparision
        • Comparing DNA and amino acids
      • courtship behaviour
        • showing behavior to find mate
    • Adaptation and Selection
      • genetic variation of bactira
        • passes a copy of the  plasmid and us a conjugation tube to do so
      • antibiotics and resistance
        • mrsa  becomes resistant to antibotics
    • Biodiversity
      • species diversity
        • measured by habit and amount of species therer
      • human diversity and species diversity
        • impacts of deforestation
        • impact of agriculture
  • a code containing 3 bases
    • which codes for 1 amino acid
  • when genes  swap cromatids
  • looking at different tissue and systems
    • E.G. organ systems and tissue types

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