Some Examples of Genetics At Work

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Some Examples of Genetics At Work

Using Mendel's ideas of genetics to show some examples of genetics at work in the world


Lecture number:
9
Pages:
2
Type:
Lecture Note
School:
University of Missouri
Course:
Anthro 2050 - Introduction to Biological Anthropology With Laboratory
Edition:
1
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Unformatted text preview:

Anthro2050 1st Edition Lecture 9 Outline of Last Lecture I. Mate Preference II. Genetics Outline of Current Lecture I. Examples of Mendelian Genetics at Work Current Lecture According to Mendel's ideas of genetics, a trait is controlled by one thing, one allele. However this idea does not always work, as there are polygenetic traits that are controlled my multiple alleles at different places on a gene. The following examples in Mendelian genetics are based on the idea of the traits being controlled by one allele. When Mendelian Genetics Works: - sickle cell anemia: a homozygous recessive trait that, if a person has only the recessive trait, is lethal and will kill them before they reach maturity. However, in some ethnic populations, the disease is very common and has a lot of carriers of the disease. The reason for this being that sickle cell anemia is common in malaria ridden areas. If a person has full blown sickle cell, the mutation of their red blood cells causes them to die young. If a person has full normal blood cells, they are likely to catch malaria and die young. However, if a person is a carrier for sickle cell anemia, only some of their red blood cells are affected, so they will not die from the sickle cell and they are strongly resistant to malaria which cannot live in that type of blood. When Mendelian Genetics Mostly Works: - There are several different ways a trait or genetic disease can be passed down, more than just an allele on a chromosome. These ways of passing information from one generation to the next can be observed in patterns in a family pedigree chart. - Autosomal dominant traits are dominant traits passed by either or both parent. Every affected individual has at least one affected parent. Most individuals are heterozygous that mate with unaffected people, so there is about a fifty-percent chance of passing it on to a child, and 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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