V. How Does Evolution Work?

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Presentation transcript:

V. How Does Evolution Work?

Mutations: 1. changes in the DNA or Chromosomes

Migration (Gene Flow) When organisms leave an area & go to another They take their genes http://images.google.com/images?um=1&hl=en&q=migration+and+evolution

2. Natural disaster, random C. Genetic Drift 1. In smaller populations, there may be large changes in gene pool due to chance 2. Natural disaster, random http://fig.cox.miami.edu/~cmallery/150/evol/23x4.jpg

Non-random Mating and Genetic Recombination 1. every sperm & egg different 2. provides different combinations of genes 3. crossing over in Prophase I http://waynesword.palomar.edu/images/cross3.jpg

Natural Selection Organism with most fit genes live and reproduce Not better organisms – best adapted to specific changes in environment Survival of the Fittest http://farm1.static.flickr.com/49/125046333_7123c38e73.jpg

VIST V = Variation I = Inheritance S = Natural Selection T = TIME -can happen in a few generations -major change (speciation) long periods of time