Non Mendelian Genetic Theories

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Non Mendelian Genetic Theories

A look at genetics ideas and theories outside of Mendel's research

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University of Missouri
Anthro 2050 - Introduction to Biological Anthropology With Laboratory
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Anthro2050 1st Edition Lecture 11 Outline of Last Lecture I. The American Eugenics Movement Outline of Current Lecture II. Non Mendelian Genetics Current Lecture Genetic research in the 1930s and 1940s gave some new ideas about genetics outside of Mendel's research. This helped bridge the gap between genetics and natural selection and showed how variation occurs through natural selection. Changes in genetic information gets passed on to new generations through the laws of natural selection, thus allowing genetic variation and evolution to occur. Chromosome theory states that this genetic information is passed along our chromosomes, with thousands of genes situated on 46 chromosomes. Linkage- when genes that are located close together on a chromosome get linked or stuck together causing the traits they control to be inherited together. Crossing-Over- while some things are linked, some are not and during meiosis they can become unstuck and some of the mother's alleles may become physically joined to some of the father's alleles. Environment can also heavily influence genetics outcome. Height, for example, is controlled by 7 genes that play a relatively small role to final height outcome. A person's diet, hormonal changes, and certain diseases they may get in adolescence can influence their height as well. Polygenic inheritance - unlike in Mendelian theory, most traits are controlled by multiple genes which allows for greater distribution of variety. If a trait like skin colour, for example, was only controlled by one gene, everyone on earth would either be extremely pale or extremely dark. However since there are multiple genes controlling skin colour, we get a wide distribution of skin tones around the world ranging from extremely pale to extremely dark and everywhere in between. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.

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