Thursday, February 26, 2015

Homologous and Analogous


Image result for human

Image result for the blue whale









1. The two different species I chose that had common Homologous traits, are humans arm and the flipper of a whale.  
     
     Some Homologous traits between the two would be the Humerus and neck bone (seven). A giant whale has the very same amount of neck bones as humans (seven). Another commonality is the large upper arm bone in the whale, which would be the humerus in humans. Much of their differences in their anatomy are due to divergent evolution. 

   They came from a common ancestor, placental mammals, named for the placenta that nourishes the fetus during development. 



 Image result for insects eyesImage result for human eye
2. The Two different species that had similar Analogous traits are humans and an insect. 

The analogous trait that they have in common is their eyes. They both have lenses and light sensitive cells that help their eyes to collect data that a brain can form into an image of their surroundings. The difference would be a human just has one single large lens per eye, as for an insect compound eye have many tiny lenses with one lens per ommatidium.  



They're no common ancestors between humans and insects, due to convergent evolution, which makes it impossible for these two to have common ancestors. 

Thursday, February 19, 2015

Thursday, February 12, 2015

Influence on Darwin

I would have to say that Alfred Russel Wallace who had the most influence on darwin on natural selection. The Contribution that wallace made to the science community took place when he ventured to the amazon river. With the opportunity of having unique and vast amount of plant and animals wallace discovered unique traits of certain animals and plants. Some of the traits the animals presented were the ability to camouflage when preditors are near and plants that had variety of mechanisims to fight off insects.

"If the environment changes, the traits that are helpful or adaptive to that environment will be different". This point affected Alfred wallaces work. For when looked at the wallace effect and how it notices certain species of plants and animals correlate into their enviorments and avoid to mate hybridly to avoid the sure higher reproduction rate.

With both of them venturing the world, Darwin more than wallace its said that they both developed the theory of natural selection, which would later be joined. But wallace had a big influence on darwin, for if not for wallace sharing his work with darwin, he would of never had published it.

The additude of the church affected him amd his release of his book, due to the anger and contraversy it would of caused towards the theory of evolution. THe church being a holy place that believes in the bible and gods word and oly his, viewed darwin and his theories to be naive. The discouragment of the church towards darwin despaired him, but with the gradual help of wallace, darwin released his book regardless of what other thought.

Thursday, February 5, 2015

My two Items

If stranded in a desert island with only two items to survive i would have to choose a fire starter and a tent. The tent for refuge and a fire starer to create warmth and to be able to cook food.