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Mendelian genetics, developed by Gregor Mendel in the 1800s, is the foundation of classical genetics. Mendel’s experiments with peas led to the discovery of two laws of genetics, although he didn’t realize some traits involve multiple places or are linked. His theories were not initially well-received, but later scientists built on them to create classical genetics. Mendel is considered the father of genetics, and traits determined by genes at a single location are known as “Mendelian traits.”
Mendelian genetics is a theory of genetic inheritance developed by Gregor Mendel in the 1800s. It is widely regarded as the cornerstone of classical genetics, and while Mendel didn’t get everything right, he came very close. Students in science classes are introduced to the concept of Mendelian genetics at a very early age to prepare them for more complex discussions about genetics.
At the time Mendel was working, not much was known about genetics. Mendel had an innovative idea for the time: to create a pure genetic line for research and meticulously record its results. He chose peas for his experiments because they grow quickly and are easy to hybridize, and along the way he made a number of remarkable discoveries, formulating two laws of genetics that were not well received by the scientific community of the time.
Mendel’s first law was the Law of Segregation, which stated that every organism inherits half of its genetic material from one parent and half from the other. The second was the law of independent assortment, which stated that traits occurred independently of each other and that traits could be divided into dominant and recessive categories. What Mendel didn’t realize is that some genetic traits actually involve multiple places that interact with each other, like eye color, and some traits are actually linked, like hemophilia, which is a sex-linked trait that only appears in people who inherit a Y chromosome.
Although Mendel’s conclusions were not entirely perfect, the concept of Mendelian genetics still amazed the scientific community. His theory explained why traits can remain hidden for generations, which ran counter to popular theories that suggested traits were inherited continuously. The idea of inheriting genetic material equally from both parents was derided, thanks to the fact that microscopes weren’t advanced enough to detect the process of meiosis.
At the time Mendel’s theories were published, they attracted little attention. In the early 20th century, several scientists referred to his work, building on the basic concepts of Mendelian genetics and adding their own concepts and ideas to create the theory of classical genetics. Although Mendel did not live to see his theories confirmed, he would no doubt take comfort in the fact that he is considered the father of genetics. In honor of Gregor Mendel, traits that are determined by genes at a single location are known as “Mendelian traits.”
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