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Monday 14 March 2022

My Notes on Evolution

 Evolution is a process that results in changes in the genetic material of a population over time Evolution reflects the adaptations of organisms to their changing environments and can result in altered genes, novel traits, and new species.

      See nature.com/SCITABLE


According to video 'evolution is results in the change in the frequencies in a population of certain gene variants over time'

     (this would be very difficult to detect with any degree of statistical certainty, even if multinomial or

 related sampling assumptions are appropriate)

gene variant is a permanent change in the DNA sequence that makes up a gene. This type of genetic change used to be known as a gene mutation, .

what kinds of gene variants are possible?


          FOUR WAYS HUMANS ARE STILL EVOLVING (VIDEO)


     HARSH CONDITIONS     HEAT (ABORIGINAL AUSTRALIANS)

       Thryroxine levels different


    ANDES: Exposure to naturally occurring arsenic

                        Population study  AS3MT more likely

                         Pop seemed to evolve better arsenic tolerance (last 11000 years?)

                          Genome study 2016        HEREDITARY

       Heights last 2 or 3000 years


                              


       Alzheimer Study  n=57000. 2017  Frequency of allele dramatically reduced in over 70s

              Statistical tests used         


           Grandmother hypothesis,

        

          



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