Part 4 - 10-3 NATURAL SELECTION
Adaptation to natural habitat Plants & animals adapt (fit into) natural habitat with physical features & characteristics 5 ways organisms adapt to environment
Food availability determines Teeth structure Herbivores Carnivores Diet Food availability determines Teeth structure Herbivores Carnivores omnivores http://www.lmpc.edu.au/resources/science/livingthings/images/omnivore.gif http://www.saburchill.com/ans02/images/190807012.jpg http://www.jamsbphotos.co.uk/USERIMAGES/Carnivore(1).jpg
Raccoon skull-omnivore http://www.skullsite.co.uk/Racoon/racoon_lat.jpg
Herbivore skull http://images.google.com/images?gbv=2&hl=en&q=omnivore+skull&btn
Carnivore skull http://animaldiversity.ummz.umich.edu/site/resources/anatomical_images/family_pages/carnivora/carnivore_teeth.jpg
Protection Methods organisms have to protect from predators include (list examples) Thorns Sharp sense of sight or smell Speed Camouflage/protective coloring
Movement methods include Stealth mode Speed Swim, fly, glide, swing from tree…
Temperature Regulation Warm blooded vs. Cold blooded Mammal vs. lizard Large ears to release heat Elephant, jack rabbit Small ears to conserve heat http://www.sanparks.org/parks/kruger/elephants/images/anatomy/ear.jpg http://www.mdk12.org/assessments/high_school/look_like/2007/biology/images/7_q.jpg
Ability to hold developing embryo during harsh conditions Reproduction Ability to hold developing embryo during harsh conditions Mate in early spring, young born late spring/early summer Organisms that have a longer gestation period may have to over winter with developing embryo
Peppered Moths Population dominant color was whitish gray & recessive was a darker color Tree bark used by moths for nesting was whitish gray Moths were camouflaged from predators
Peppered Moths & Industrial Revolution Increased factories Increased burning of coal Increased pollution Change in Peppered Moth Population Increased dark colored bark due to pollution Increased dark moth pop & decreased white pop.
PM & IR Introduction of air quality standards Decreased pollutants in air Tree bark slowly changed back to original lighter color Population of white moths started to increase Population of darker moths started to decline
Peppered Moth examples http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/K/Kettlewell.jpg
Recessive trait found in humans A response to survival from malaria Sickle Cell Anemia Recessive trait found in humans A response to survival from malaria RBC is altered to limit ability to hold oxygen Allows population to survive in areas where malaria was a health problem http://services.epnet.com/getimage.aspx?imageiid=2560