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Biology Prezi

talks about natural selection and Charles Darwin

Olivia Uribe

on 18 February 2010

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Transcript of Biology Prezi

NATURAL SELECTION Four Main assumptions necessary for natural selsction:
1. Variation- Depending on their habitat, some animals of the same species differ from one another. (e.g. some anteater's noses are longer than others')
2. Heritability- Characteristics are inherited from parents and passed down to the child so that they inherit the same characteristics. (e.g. long-beaked penguins produce long-beaked penguins)
3. Overproduction- When a species produces too many offspring, that they cant survive because of various reasons.
4. Repordictive Advantage- Some variations allow a species that possesses reproduction advantages, to have more offspring than the species that does not posess them. (e.g. smaller food for smalleer parrots, and bigger food for bigger parrots) Charles Darwin Darwin went to Christ's College in Cambridge, and got a degree in theology. But before that, he had studied medicine and the sciences.
Over the course of the Beagle ship's 5 year voyage, Darwin made collections of rocks, fossils, plants, and animals.
Darwin read a book called Principles of Geology-a book proposing that earth was millions of years old.
After reading this book, Darwin started to find fossils of smaller living mammals, and also learned about eaerthquakes. earthquake Darwin later went to the Galapagos Islands, and began to collect mockingbirds, finches, and other mammals on the four islands he visited.

He then noticed that no two islands had the same type of annimal, but that they were slightly different varieties. Darwin then went to pigeon breeders to find out why new species could gradually change over a period of time from ancestral species.

He thought that if humans can breed pigeons themselves to get a certain breed by artificial selection, then maybe the same process could happen in nature Darwin's theory has four basic principals: Variation, Heritability, Overproduction, and Reproductive Advantage.

He called this theory Natural Selection! WOLVES (Canis lupus)

- One of the 4 assumptions is variation. wolves show variation by their coat. some are thicker than others, which means they live in the snowy area, and the wolves with a thinner coat live in the warmer areas.

- Another one of the 4 assumptions is heritability. Red Wolves are smaller and have big ears with short fur, meaning they will produce wolves with those same features.
-While the Artic wolves produce wolves with a coat that is white and much thicker.

- Another one of the 4 assumptions is overproduction. Some wolves produce more pups then they can take care of, and they end up a meal for another animal.

- Another one of the 4 assumptions is reproduction advantage. Some wolves, like the Grey Wolf, are fast, and have sharp teeth to help them hunt. While the Red Wolf has large ears to help them cool down when the climate is hot or humid. DOLPHINS (Tursiops truncatus)

- One of the 4 assumptions is variation. Dolphins vary in the shape of their body, fins, and teeth.

- Another of the 4 assumptions is heritability. The River dolphin has a long, narrow beak, and will produce dolphins with those features.
- While the Bottlenose dolphin has a shorter, thicker beak.

- Another of the 4 assumptions is overproduction. Some dolphins produce more calves then they can look after, and are vulnerable to a shark's attack.

- Another of the 4 assumptions is reproductive advantage. Most dolphins are extrememly smart, which is good to be for surviving.
-There are also blood vessels in the dorsal fin of a dolphin that help to control their body temperature. PENGUINS (Spheniscus demersus)

- One of the 4 assumptions is variation. Penguins differ in size, hight, and their feather patterns.

- Another of the 4 assumptions is overproduction. The Emperor penguins can only produce one egg, and yet it is still hard to take care of because of the cold weather.
- But when the egg does hatch, they have to watch out for seals that feed on the babies.

- Another of the 4 assumptions is heritability. Penguins, such as the Adelle penguin, are short, so they will produce short penguins
- While the Emperor penguin will produce taller penguins.

- Another of the 4 assumptions is reproductive advantage. For the Rockhopper penguins, they are white on their bellies, and dark on the top for camouflage from predators.
- While for the African penguins, with their torpedo-shaped body and stiff wings, they can easily glide through the water at speeds of 20 miles per hour. WORKS CITED

*Rock photo- http://images.google.com/imgres?imgurl=http://skywalker.cochise.edu/

*Fossil photo- http://images.google.com/imgres?imgurl=http://www.earthhistory.org

*Plant photo- http://images.google.com/imgres?imgurl=http://www.laspilitas.com

*Animals photo- http://images.google.com/imgres?imgurl=http://www.thefeltsource.com

*Charls Darwin photo- http://images.google.com/imgres?imgurl=http://www.arps.org

*Wolf photos- http://images.google.com/imgres?imgurl=http://www.animalpicturegallery.net---http://images.google.com/imgres?imgurl=http://www1.pu.edu.tw---http://images.google.com/imgres?imgurl=http://images2.layoutsparks.com

*Dolphin photos-http://images.google.com/imgres?imgurl=http://www.nwf.org---http://images.google.com/imgres?imgurl=http://www.hitech-dolphin.com---http://images.google.com/imgres?imgurl=http://i.dailymail.co.uk

*Penguin photos-http://images.google.com/imgres?imgurl=http://www.takeprideinutah.org---http://images.google.com/imgres?imgurl=http://tiger.gsfc.nasa.gov

*Wolf name and facts- http://wiki.answers.com/Q/What_are_wolves_scientific_name---http://www.enchantedlearning.com/subjects/mammals/dog/Graywolfprintout.shtml---http://www.defenders.org/wildlife_and_habitat/wildlife/red_wolf.php---

*Dolphin name and facts-http://www.crystalinks.com/dolphin.html---http://www.hickerphoto.com/dolphin-dorsal-fin-11157-pictures.htm

*Penguin name and facts-http://www.hickerphoto.com/penguins-169-pictures.htm---http://www.antarcticconnection.com/antarctic/wildlife/penguins/rockhopper.shtml---http://www.antarcticconnection.com/antarctic/wildlife/penguins/african.shtml

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