Charles Darwin's 4 postulates

Diego Gutierrez

Who is Charles Darwin?

Charles Darwin (1809-1882) is currently one of the most influential human beings in history due to the global influence caused by his research conducted back in the 19th century. His popularity began to grow when biologists and scientists discovered and made public his prosperity and success on the HMS beagle voyage. Over the 5 year trip, Darwin came to find a variety of natural specimens like fossils, plants and different species on birds which helped his formulate his theory on evolution. Along with Richard Owen, Charles Darwin wrote his findings in his personal journal which later was bought and published as a section of the famous book "Zoology of the Voyage of the Beagle". This voyage clearly had a colossal impact on Darwin's view to natural history. The two hundred year old biologist conducted a revolutionary theory about the origin on living things which was later on (1930-Present) derived and improved to what we study today.

Variation

Variation is a single branch out of the numerous terms in genetics, it is the genetic event where there is a variety of differences within the same species. Humans for instance are all genetically alike although there are tons of differences within us; Long/Short noses, slanted eyes, different eye/hair color, etc. This is caused to the offspring when two individuals of different sex interact sexually and produce a newborn with a mixture of each of their own characteristics. This is why everybody is different.
Big image

Inheritance

According to Darwin, Inheritance is ultimately that each of the cells inside of the body throw out a series of 'gemmules' which in a way entered the egg and sperm and were transformed into the hereditary characteristics.

A good example for the previous statement is how an organism learns something that their parents did out of simple nature. Their nurture learnings on the other hand will later on be passed on to their kids, dogs for instance.

Inheritance is the biological process to which an offspring looks and acts like their parents and brothers.

Big image

Differential Survival

Throughout Darwin's journey he found out how organisms adapted to external factors such as the different environments and natural disasters. Species are able to survive a certain tolerant range of the abiotic factors. The differential survival is basically Darwin's theory to what species can do in order to maintain themselves healthy and alive. Ants are a good example when they gather food all year long in order to hibernate in the winter inside their dominant state.
Big image

Extinction

Extinction is a big world and according to Darwin's theory of natural extinction, species with some traits that are not suited for their survival will eventually die. Extinction within different species have occurred gradually and constantly throughout the history of nature and life.

Charles Darwin was contemptuous to those people who believed that extinction was caused by great catastrophes, Darwin believed that extinction of species was caused by the misguidance and failure of species competition with another species. He argues that extinction was caused by biological effects rather than physical effects.

Big image