Changes
From Biolecture.org
no edit summary
<p> </p>
<p><span style="font-size:20px"><strong>Evidences to Redress Darwin's Theory of Evolution</strong></span></p>
<p> </p>
<p> </p>
<p>To understand conceptAbstract</p> <p> Darwinism is a theory of biological evolution developed by English naturalist Charles Darwin, stating that all species of organisms arise and develop through the natural selection of small, inhereted variations that increase the individual's ability to compete, survive and reproduce. Pangenesis, which is a theory of heredity hypothesized by Darwin, cause was supporting Darwinism as it explained heredity of variations. I found that Gregor Mendel's experiments and consequenceother evidences attacked Darwinism by refuting pangenesis. Hence, Darwinism supported by pangenesis is not perfect to explain the biological evolution.</p> <p> </p> <p>Introduction</p> <p> Since 1832, when Charles Darwin arrived at Galapagos islands where various traits and species exists, the concept of evolution has been considered as one ofthe most powerful evolution is very important tool to research on a number explain the variety and origin oflife. But, as crucial evidences and theories such as biology field. Since Mendel's law of inheritance emerged, the time theory of evolution has been changed gradually, which makes the first model obsolete. Through that way, we are ignorant about what Darwin's original theory tried to say. Now, in this essay, who suggest the we want to focus more about Darwin's first model of evolutionand criticize it on many biological terms.</p> <p> </p> <p><strong>Darwin's Explanation : Gemmule and Pangenesis</strong></p> <p> Observing taxidermied birds' traits, Darwin found that there are many controversies around evolution including conflict correlation between religions their specific traits and evolutioniststheir habitats. He had inspiration from Hippocrates's view on the topic, which made Darwin establish and different views publish his view with "pangenesis". Pangenesis was Darwin's model to explain the way mechanism for heredity and evolution using imagined particles named as gemmule which appeared in his book 'The Variation of Animals and Plants under Domestication', pubilshed in 1868, nine years after pubilcation of his famous book 'On the Origin of Species'. </p> <p> Gemmules were assumed to be spread within all parts of body and carried in the bloodstream to the evolution occursreproductive organs where they accumulated in germ line cells. Gemmules were also able to be changed easily affected by surroundings or natural pressures. In this short essayIt seemed to explain well how acquired traits are inhereted, we will focus about yet there were lots of problems preventing it accepted.</p> <p><strong>Defects on Pangenesis</strong></p> <p>1. Pangenesis can not explain Mendel's Cross expriments.</p> <p> Gregor Mendel's study totally defeated Darwin'smechanism. Mendel proved that heredity has at least one first model throughcertain discrete unit to express one trait. Unfortunately gemmule couldn't be that unit as it was continuous concept and did not have method to explain law of dominance, segregation and independent assortment..</p> <p>2. Acquired traits are not inherited.</p> <p> Lamarckism was very similar to Darwinism in that both were trying to explain that evolution occured within relatively short time. Both are not true because acquired traits are not inherited (but epigenome), which cannot affect phynotypes. </p> <p>3. Pangenesis can not explain asexual propagation</p> <p> According to the pangenesis, gemmule should be inhereted by sexual propagation. However, there are many asexual reproductions such as binary fission, budding, and vegetative propagation.</p> <p> critical view with well-known evidences</p> <p><strong>Reference</strong></p> <p>https://en.wikipedia.org/wiki/Pangenesis</p> <p>https://en.wikipedia.org/wiki/Gemmule_(pangenesis)</p> <p>https://en.wikipedia.org/wiki/On_the_Origin_of_Species</p> <p> </p> <p> </p>
