Need New Ideas for Experiments.
ajays at sfu.ca
Mon Oct 23 23:28:37 EST 1995
There are a lot of things that you can do and you definitely don't need
to extract DNA.
If you are familiar with Natural Selection then you can go about doing
an expt which will take a couple of months to do and prove to you that
natural selection does happen.
You can take red eyed (wild type flies) and white eyed males in a ratio
of 1:1 and allow them to mate to white eyed females. If you culture the
flies over a couple of generations you will see a reduction in the
number of white eyed offsprings that is to say that you will be seeing
way more red flies than white eyed flies. You can explain this as the
females preference to mate with red eyed flies over white eyed flies.
This then tells you that red eyes are better suited to survive in nature
than white eyed flies and that natural selection selects for red eyes.
If you want to do something simpler then you can demonstrate that red
eyes are dominant to white eyes by taking pure breeding red eyed flies
and crossing them to pure breeding white eyed flies. If red indeed is
the dominant trait then you will get all offsprings with red eyes.
Hope this will be of help to you do not hesitate incase you want more
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