Homologous Vs. Analogous Traits

The two species I choose for the Homologous Trait is the human arm and a seals flipper. Both are homologues as front limb invertebrates. They have the same bone and muscle structure just in different places. They have the humerus, radius and ulna, carpals, metacarpals, and phalanges. They both have evolved from the same ancestry some time in the past.  They do have similarities in structure of course, but are different in function. The seals flipper is used for swimming and the human hand is used for grasping and holding.  That makes both of these structures homologous.

 

 

 

An example of an Analogous Trait would be a human eye and an octopuses eye. Both are used for seeing of course but have very different structures. They are also from different ancestry, so they do not met up anywhere down the road. The octopuses eye is said to be superior over a human eye because it does not have a "blind spot". If humans did not have a "blind spot" we would have equal eye structures as octopuses. Also humans and octopuses are far away from each other on the tree of life and we of course live in different habitats and environments.

 

Hopefully I got this right but here we go:


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Introduction to Evolution (Charles Darwin)

Introduction to Anthropology
Charles Darwin & Jean Baptiste Lamarck

1. The one person I would say that was very influential to Darwin's Theory of Natural Selection is Jean Baptiste Lamarck.

2. Jean Baptiste Lamarck's believed in evolution. He was a French botanist and invertebrate zoologist who formulated one of the earliest theories of evolution. His contributions to science included work in meteorology, botany, chemistry, geology, and paleontology, but he is best known in his work in invertebrate zoology and his theoretical work on evolution.

Http://library.thinkquest.org/27407/lamarck.htm

3. Lamarck's theory actually explains how organisms adapt to change in their environment, basically they change when their surroundings changes. Darwin says that the strongest organism adapts to their environment and can be apart of any environment if strong enough. With both Lamarck's and Darwin's ideas they weren't very different, so they had no problem coming up with almost the same idea.

4. I believe that Darwin could not develop his theories on his own without help from Lamarck. Since his discoveries or findings were connected to Lamarck, and Lamarck was the first to come up with evolution, Darwin wouldn't have any further thoughts without Lamarck. A big reason I also read about, was that Darwin's theory depended on natural selection, which in theory actually never changes.

5.The church actually never changes their ideas or beliefs about evolution theory. The church didn't think his book "Origin of Species" would be considered but accepted as a scholastic book, which I believe was a great achievement for Darwin.

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