РефератыИностранный языкGrGregor Mendel Essay Research Paper subject

Gregor Mendel Essay Research Paper subject

Gregor Mendel Essay, Research Paper


subject = biology


title = Gregor Mendel


papers =


Gregor Mendel played


a huge role in the underlying principles of genetic inheritance. Gregor was


born, July 22 1822 in Heinzendorf, Austrian Silesia (now known as Hyncice,


Czech Republic), with the name Johann Mendel. He changed his name to Gregor


in 1843. He grew up in an Augustinian brotherhood and he learned agricultural


training with basic education. He then went on to the Olmutz Philosophical


Institute and later entered the Augustinian Monastery in 1843. After 3 years


of theological studies, Mendel went to the University of Vienna, where 2 professors


influenced him; the physicist Doppler and a botanist named Unger. Here he learned


to study science through experimentation and aroused his interest in the causes


of variation in plants. He returned to Brunn in 1854 where he was a teacher


until 1868. Mendel died January 6 1884.


In 1857, Mendel began breeding garden


peas in the abbey garden to study inheritance, which lead to his law of Segregation


and independent assortment. Mendel observed several characteristics of the


garden peas which include: plant height (tallness/shortness), seed color


(green/yellow),


seed shape (smooth/wrinkled), seed-coat color (gray/white), pod shape


(full/constricted),


pod color (green/yellow), and flower distribution (along length/ at end of


stem). Mendel keep careful records of his experiments and first reported his


findings at a meeting of the Brunn Natural History Society. The results of


Mendel’s work were published in 1866 as “Experiments with Plant Hybrids” in


the society’s journal.


Mendel’s Law of Segregation stated that the members


of a pair of homologous chromosomes segregate during meiosis and is distributed


to different gametes. This hypothesis can be divided into four main ideas.


The first idea is that alternative versions of genes account for variations

p>

in inherited characters. Different alleles will create different variations


in inherited characters. The second idea is that for each character, an organism


inherits two genes, one for each parent. So that means that a homologous


loci


may have matching alleles, as in the true-breeding plants of Mendel’s P generation


(parental). If the alleles differ, then there will be F hybrids. The third


idea states that if the two alleles differ, the recessive allele will have


no affect on the organism’s appearance. So an F hybrid plant that has purple


flowers, the dominant allele will be the purple-color allele and the recessive


allele would be the white-color allele. The idea is that the two genes for


each character segregate during gamete production. Independent assortment states


that each member of a pair of homologous chromosome segregates during meiosis


independently of the members of other pairs so that alleles carried on different


chromosomes are different distributed randomly to the gametes.


Mendel’s


work was not recognized right away as an important scientific breakthrough.


In 1868 Mendel was promoted to abbot at the monastery and gave up his


experiments.


Aside from his fellow monks and his students his work was ignored. In fact


the importance of Mendel’s work was not discovered until 1900, sixteen years


after his death. His work was discovered by three European scientists: Hugo


De Vries, Carl Correns, and Erich Tschermak, working independently as they


preformed their own similar experiments. They credited Gregor Mendel as the


discoverer of the laws of heredity.


In conclusion, Mendel’s work was very


important to the science community, and is to this day being studied. All


his work was done without himself ever receiving credit while he was alive.


His laws of heredity are still used today and he now has received credit as


the discoverer of the laws of heredity.


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