B2~ Biology1

  • Created by: xmishaal
  • Created on: 09-06-15 20:38
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  • B2~ Biology
    • Classification
      • Evolutionary relationships: How organisms are related.
        • Ecological relationships: How organisms interact with each other.
      • Natural Classification: Based on the evolutionary relationship and genetic similarities between organisms.
      • Artifical Relation ships: Based on appearance rather than genes- only used to identify organisms.
      • DNA sequencing: Allows us to see genetic difference between different groups of organisms.
    • Species
      • A species is a group of organisms which can interbreed with each other to produce fertile offspring.
      • Asexual Reproduction: An organism reproduces by making a copy of itself. There is no inbreeding with another organism.
      • Hybrids: If you interbreed a male and female from different species you'll get a hybrid. Hybrids are infertile and its difficult to classify them.
      • Organisms evolve over time. Sometimes they evolve so much that they produce a new species.
      • The binomial system: Each species is given a two part Latin name. The first part refers to the genus and the second part to the species.
    • Pyramids of Biomass and numbers.
      • Dry biomass: You'd dry out all the water from the organisms before weighing them.
      • Pyramids of biomass are almost always pyramid shaped whereas pyramid of numbers can be of any shape.
    • Energy Transfer and Energy flow
      • Energy lost at each chain of the food chain is for staying alive e.g respiration.
      • Material and energy are also lost as waste products.
        • Egestion is where food that cant be digestions passes out as feces.
        • Excretion is when the waste products are released e.g urine.
        • Food chains only go up to five trophic levels because so much energy is lost so that there wouldn't be enough.


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