Explore BrainMass

Explore BrainMass

    Biology: the process of natural selection as defined by Darwin.

    Not what you're looking for? Search our solutions OR ask your own Custom question.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    Discuss the process of natural selection as defined by Darwin. How did Darwin's theories differ from those of his predecessors? In your opinion, have his theories proved to be correct? Why and why not?

    Discuss how the various "agents" of change can lead to a new species.

    © BrainMass Inc. brainmass.com September 27, 2022, 5:46 pm ad1c9bdddf
    https://brainmass.com/biology/natural-selection/process-natural-selection-defined-darwin-495871

    SOLUTION This solution is FREE courtesy of BrainMass!

    Darwin believed that all organisms of life came from a common ancestor if you go back far enough in time. He believed that organisms began to look different as features in the offspring become selected for by the environment they live in. The fact that there are many different types of species in the world would be explained by the fact that these organisms, by chance, evolved changes that promoted survival in the environment they lived in. As time went on, the environment would change in different ways, and so organisms that were lucky enough to develop features that gave them a competitive advantage in the current environment would pass those genes on in the offspring.

    These ideas were not that different from other people before Darwin. Jean-Baptiste Lamarck believed that organisms evolved but that it occurred from using a feature or from its atrophy due to lack of use. For example, giraffes would have long necks because they used their necks a lot and so there necks would evolve to become longer and longer. There are others here at this page http://library.thinkquest.org/C004367/eh1.shtml

    I would say that yes, his theories have been correct. We can see that natural selection is taking place on levels that Darwin could not have studied at his time. For example, we see examples of proteins in cells evolving by comparing similar proteins in different organisms and see a single amino acid change between these proteins and the result is different function in these proteins. We can see natural selection taking place in the creatures of our oceans. For example, there are jelly fish that have a primitive eye that can only distinguish between shades of color. There are many other examples of the concept of natural selection proving correct today.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com September 27, 2022, 5:46 pm ad1c9bdddf>
    https://brainmass.com/biology/natural-selection/process-natural-selection-defined-darwin-495871

    ADVERTISEMENT