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Natural Selection in Action
Transcript of Natural Selection in Action
The way evolution works is through a process called natural selection.
Natural Selection involves the following steps: A species produces more offspring than will be able to survive. 1. OVERPOPULATION Organisms within the species must struggle to survive. They must compete for resources like food, shelter and mates. They must also try to avoid being eaten by other organisms. Additionally, disease may kill organisms. 3. STRUGGLE TO SURVIVE 4. SUCCESSFUL REPRODUCTION Choose one of the following organisms for which you will create the four steps of natural selection.
How did this trait give them an advantage over competing organisms. What traits did the other organisms have? 2. GENETIC VARIATION Each individual organism in a species is slightly different from every other individual. These differences are found in the genes and result in different traits like color, speed, size and ability to find food. The organisms that survive to adulthood may have the chance to reproduce. The key to natural selection is successful reproduction because only through reproduction do genes get passed on to the next generation. 1. Overproduction There are too many cheetahs in one area. 2. Genetic Variation
About half of the cheetahs are faster than the others. 3. Struggle to Survive
There is not enough food for all the cheetahs to survive. 4. Successful Reproduction
Cheetahs that caught food will live to adulthood.
There will be more fast cheetahs reproducing than slow cheetahs.
The next generation will have more fast cheetahs. http://www.bbc.co.uk/nature/collections/p00hldcc#p00715gc Giraffes - long necks Zebras - have stripes Cactus - has spines Eagle - Talons Due: Monday 2/11 Some traits increase the chance that the organism will survive and reproduce while other traits decrease the chance of survival and reproduction. 6th Grade Essential Question 7th Grade Essential Question Draw a diagram of an atom
Use the 3 particles from yesterday Describe an adaptation. Could you draw one for Nitrogen?
Atomic # 7 A trait that helps an organism to survive and REPRODUCE Grab a green handout from the front table.
Be in your seat when the bell rings.
Get started on the Science Starters The next generation, therefore, will look more like the organisms that survived and reproduced since they inherited their genes.
Those individual that are best adapted to their environment will be more likely to survive to adulthood and to reproduce. Vs. What were some specific adaptations that the cheetah has that helps it to run at 65 mph? How do the different traits get passed down to offspring? The most important step of natural selection is:
SUCCESSFUL REPRODUCTION What do you remember from part 1 of:
What Charles Darwin Never Knew