The Science of Evolution by: allie d'alessandro

Evolution- "The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth."

- Evolution is very important in the science world. It explains how we and animals change to survive and adapt to their surroundings.

- One of the most popular theory is Darwin's theory.

Natural selection can change a species in small ways, causing a population to change color or size over the course of several generations.

-Darwin's theory is known as the "modern evolutionary synthesis."The physical and behavioral changes that make natural selection possible happen at the level of DNA and genes. Such changes are called mutations.

-Natural selection is meant to preserve and grow efficient genetic mutations.

one member of a species grew taller that is an advantage. That specie's offspring would then inherit that trait and pass it down. The species with out the advance would eventually die off and that would leave the species with the longer neck/legs (advantage.) Natural selection is the preservation of having an advantage to survive in the wild.

Process of Natural Selection

Variation- Organisms within a population have their own variation in appearance and behavior (size, hair, facial markings, color, voice properties, and/or, number of offspring.) However, some traits are the same for every species like how many eyes they have or the amount of vertebrae.

Inheritance- Some traits are consistently passed down to the offspring. These traits can be heritable, other traits can be strongly influenced by environmental conditions and show weak heritability.

High Rate of Population Growth- Most populations have too many offspring per year than their local resources can support, which causes a struggle for resources.

Differential Survival and Reproduction- Individuals possessing traits well suited for the struggle for local resources will contribute more offspring to the next generation.

Mutations

Mutations can be caused by random errors in DNA replication or repair, or by chemical or radiation damage.

-Usually, mutations are either harmful or neutral.

-Sometimes the mutation can be helpful/beneficial to the species and that is from the cause of natural selection. That mutation will then be passed down to later generations and spread through the population.

Horses adapted from when they were small most likely to avoid getting killed by their predators, and when that was not as effective, They grew bigger and we started using them for travel.

-Genetic drift can be another reason for a mutation.

-In each generation, some individuals may, just by chance, leave behind a few more descendants than other individuals. The genes of the next generation will be from the surviving individuals, but not necessarily the healthier or adapted ones. This is called genetic drift.

Summary

-Natural selection is the preservation of a functional advantage that enables a species to compete better in the wild.

-The process includes variation, Inheritance, population growth, and differential survival or reproduction.

-Mutation is the effect of natural selection and is the helpful adaptation passed down. Genetic drift can be an error in the DNA or more spouses. That can make a lesser gene be passed down thats not necessarily the helpful one.

Sources

"Evolution and Natural Selection." Evolution and Natural Selection. N.p., n.d. Web. 18 Feb. 2017.

"Natural Selection." BrainPOP. N.p., n.d. Web. 21 Feb. 2017.

"Natural Selection: How Evolution Works." ActionBioscience - Promoting Bioscience Literacy. N.p., n.d. Web. 21 Feb. 2017.

"Natural Selection." Natural Selection. N.p., n.d. Web. 21 Feb. 2017.

"Natural Selection." Wikipedia. Wikimedia Foundation, 17 Feb. 2017. Web. 21 Feb. 2017.

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