Discussion 1 Synopsis

Discussion 1 Synopsis - UnscramblingtheEgg...

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Unscrambling the Egg Antonio Serrato, Kelly Robinson, Virginia Bass, Nicole W Embryonic development remained a mystery for ages and slowly moved from descriptive  embryology in the 1800s to experimental embryology which experimented with early growth and  development of living organisms in their embryonic stage during the 1900s.  The knowledge we  have today of development is due to the work of several great scientist which worked with the  common fruit fly in order to unravel the mysteries of development. Work started in 1897 when Thomas Morgan proposed a chemical gradient for  earthworm-decapitation experiment findings.  He found evidence that chemical gradients in the  body designated body parts, such as a strong chemical concentration in the head would mount  signals to form eyes, mouth, brain, etc: the greater distance posteriorly the worm was cut in half,  the longer it took the posterior piece to regenerate anteriorly.  Shorter pieces took longer than  longer pieces in order to begin to regenerate with a few short pieces not regenerating at all.  Surprising in his findings was that if two posterior ends are sewn together and an end is cut off  then a new posterior end will regenerate (not an anterior end).  Morgan attempted during the  1900s to induce mutations artificially through “biological abuse” but did not succeed and it took  another scientist to unravel this mystery and push mutations to a new level.   Hermann Muller, once a member of Morgan’s inner circle, had much greater success  with inducing mutations about 15 years later. In 1920, Muller joined UT at Austin and began  experimenting with the effects of heat because he recognized an urgent need to find ways of  inducing mutations artificially. He soon switched his attention to X-rays and in 1926 discovered 
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