NS vs. AS

NS vs. AS

1. Natural Selection

   • Natural Selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring
   • A mutation is a change in the usual DNA sequence at a particular gene locus
   • Adaptation is a change or the process of change by which an organism or species becomes better suited to its environment
   • Natural Selection requires a struggle for existence, variation and inheritance to be present in an organism
   • EX.) A giraffe not being tall enough to reach its food on a tree

2. Artificial Selection

   • Artificial selection is the identification by humans of desirable traits in plants and animals
   • • Pro: elite offspring w/ desired traits. Con: decreases genetic variation
   • 2.) Gene Therapy - an experimental form of treatment that uses gene transfer of genetic material into the cell of a patient to cure the disease
     • Pro: prevents/cures genetic disorder Con: uncertain effect
   • 3.) Gene Modification - a technique to change the characteristics of a plant, animal or micro-organism by transferring a piece of DNA from one organism to a different organism
     • Pro: enhance of nutrition Con: unnatural; may be unsafe

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