Categories
EVOLUTION

Evolution in action


Have  you  ever come across the term  a an
antibiotic resistant
bacteria
. A person took the treatment but didn’t get
better?Let us figure this situation out.Variations exist among
organisms of the same population.A few of this bacteria have a gene
that make them survive when a patient  take this particular
antibiotic.As the rest of the bacteria die  ,the
survived group reproduce   and pass on this  specific to
the next generation. Eventually this
lead to bacterial population of an antibiotic
resistant strain. Check  power point presentation   to
see more examples of this phenomena.  

Categories
EVOLUTION

Darwin’s Theory Of Natural Selection.


Topic Darwin’s Theory of natural selection There are a few theories that attempt to explain or show how organisms change  (evolve)  over time  .ee
1.The Branching Theory.
2.The Theory Of Spontaneous Generation
3.  Use And Disuse.
4.The Theory Of Natural Selection.
Darwin’s theory of natural selection proposed that nature(the environment) is a major contributing factor of evolution.In other words organisms  with traits that help them survive in a changing environment ,will reproduce and pass on their traits to the next generation.A logical sequence of ideas explain this theory.
the power point presentation will help you understand how species change over time
Also you may read about the other proposed theories,check these  links:
     Khanacadmey.com
Wikipedia.com
you know that ,Darwin could not explain the genetic basis of variations.

 

Categories
EVOLUTION

Fossils, An Evidence Of Evolution


Hi, Do you have any questions about fossils? In the
following presentation you will be able to answer these questions
and learn how fossils are formed.

How can we use fossils as n evidence of
evolution
?
Types of fossils Where
can many fossils be found? How are sedimentary rocks
formed? Sedimentary rocks are formed from sediments such as rock
particles, silt, and mud. Name some of the fossils found in
SR.