Biology (level 1)


Assignment for Mr. Fisher's class (level 1)
Mind Map by jmlari12, updated more than 1 year ago
Created by jmlari12 over 8 years ago

Resource summary

Biology (level 1)
  1. Natural Selection
    1. Process by which organisms with variations most suited to their local environment survive and leave more offspring.
      1. It occurs in any situation in which more individuals are born that can survive, there is natural heritable variation, and there is a variable fitness among individuals.
        1. Ex. If there are green grasshoppers and brown hoppers that live on grass, the green grass hoppers will survive and reproduce because of camouflage.
          1. The grasshoppers' predators (for example a bird) will spot the brown grasshoppers more easily and the brown grasshoppers will have a hard time surviving and reproducing.
            1. This means that the green grasshoppers will become more common than brown grasshoppers overtime because green grasshoppers will reproduce more green grasshoppers and the brown grasshoppers will be unable to reproduce at the same rate since the population of brown grasshoppers will decrease.
    2. Fitness
      1. How well an organism can survive and reproduce in its enviroment
        1. Adaptations is a big factor in fitness
          1. Survival of the fittest is the difference in rates of survival and reproduction
      2. Adaptations
        1. Any heritable characteristic that increases an organism's ability to survive and reproduce in its enviroment
          1. They can involve body parts or structures, colors, physiological functions, or behaviors
        2. Lethal Alleles
          1. Alleles are the different forms of a gene
            1. Lethal alleles can get passed on in a gene pool like regular alleles.
          2. Mutations
            1. Heritable changes in genetic information
              1. The affect of mutations on genes vary widely
                1. Some have little or no effect
                  1. Some produce beneficial variations
                    1. Some negatively disrupt gene function
                    2. Often they produce proteins with new or altered functions that can be useful to organisms in different or changing enviroments
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