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Natural Selection to Evolution

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Chi Oma

on 22 February 2013

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Transcript of Natural Selection to Evolution

By: Chioma Ekwunazu & Lilianna Mischke The Journey: Natural Selection to Evolution Natural Selection Evolution Textbook Definition: the process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species

Our Definition: when organisms have specific traits that better enable them to adapt to a certain environment and allow them to have a higher chance of reproducing and surviving than other members of that species Textbook Definition: the struggle between organisms to survive as they attempt to use the same limited resources

Our Definition: two or more organisms struggling to gain a resource COMPETITION Example of VARIATION: Textbook Definition: any natural or artificial process that results in differential reproduction among the members of a population so that the inheritable traits of only certain individuals are passed on, or are passed on in greater proportion, to succeeding generations

Our Definition: the cycle in which dominant traits are passed on to each of the following generations of organisms SELECTION Textbook Definition: the gradual change in a species over time

Our Definition: the progressive process in which change occurs within a certain species over a period of time Mod 4/5 Citation: How Does Natural Selection Lead to Evolution? Over long periods of time, natural selection can lead to evolution in a species. Characteristics in a species may vary and result in permanent change. This occurs when the helpful variations accumulate and the inconvenient ones disappear. The helpful variations allow reproduction and survival. The organisms containing the unhelpful variations will die off, increasing the amount of favorable traits in the species. This completely changes the characteristics of the species' population.
There are many factors that affect natural selection. They are as follows: over production, adaptation, competition, variation, and selection. OVER PRODUCTION Textbook Definition: producing far more offspring than can possibly survive

Our Definition: reproducing more organisms than able to provide for Example of OVER PRODUCTION: ADAPTATION Example of ADAPTATION: Textbook Definition: a trait that helps an organism survive and reproduce

Our Definition: characteristics that increase an organisms' life expectancy Example of COMPETITION: VARIATION Textbook Definition: any difference between individuals of the same species

Our Definition: an intraspecefic alteration Example of SELECTION: Example- Female Spiders
Female Spiders lay as many as 3,000 eggs at one time. This amount of offspring is far more than can survive, due to the elements, predators, competition, etc. However, producing this many spiders allows a higher chance of survival for the offspring because if there are a greater number of offspring, there will be a better chance of more surviving against limiting factors and the environment. Example- Sloths With Long Claws
Having long claws helps sloths survive better in their environment by providing a way of successfully griping the tree branches that they live in. This allows protection in the trees and provides a source of food from the leaves. Example- Hawks Fighting Over a Mouse
Food is a limited resource needed to sustain life. Common prey for hawks are mice. Hawks must have food and if food is scarce, becoming a limiting factor, they will fight/compete in order to obtain it. Example- Colors Varying Within the Same Species of Ladybugs
Ladybugs can come in many different colors such as orange, yellow, or red. These variations can benefit some of the species more than others. For example, if a population of ladybugs lived in an area with red flowers, the bugs with the red colors would camouflage more and have a higher chance of escaping predators and surviving than the ones without this variation. Science Explorer 2009 Cells and Heredity Book

dictionary.com Example-Darwin's Finches with Small Beaks Being Dominant
Many of the organisms that make up a population of Darwin's Finches have sharp beaks for pecking on small seeds, during a rainy season. So, the majority of the finches in the next generation will have small beaks. When the seeds get even smaller the following year, the beaks on the finches become smaller. Thanks For Watching
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