Population Genetics

clairegillian95
Mind Map by , created over 5 years ago

First year Genetics & Society (Population Genetics) Mind Map on Population Genetics, created by clairegillian95 on 04/03/2014.

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clairegillian95
Created by clairegillian95 over 5 years ago
Autosomal Dominant Traits
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Tay Sachs Disease
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Oculocutaneous Albinism
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GCE Core Mathematics 2
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Mitosis & Meiosis
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Genes, Alleles, & The Central Dogma
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Cytogenetics
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BIOSCI101 Evolution - Lecture 3
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Sickle Cell Anaemia
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Population Genetics
1 In a population there are many different phenotypes, proteins, and alleles (DNA)
2 Allele frequencies vary from population to population
2.1 Africans have a high frequency of the sickle cell allele, Northern Europeans have a high frequency of the cystic fibrosis allele, Ashkenazi Jews have a high frequency of the Tay Sachs allele
3 Hardy-Weinberg Law
3.1 Frequencies of alleles of the same gene will remain the same from generation to generation provided: that population is infinitely large, mating is random, selection is not occurring, no mutation , no migration
3.2 Problem: populations vary in size
3.2.1 Genetic Drift
3.2.1.1 Random changes in gene frequencies due to chance; seen in small populations
3.2.1.2 Causes
3.2.1.2.1 Size is small over a long period of time
3.2.1.2.2 Founder Effect
3.2.1.2.3 Bottleneck Effect
3.2.1.2.3.1 Genetic bottleneck: some genotypes do not survive
3.3 Problem: there are many situations where mating is not random
3.3.1 Positive Assortative mating, Negative Assortative mating
3.4 Problem: inbreeding
3.4.1 Preferential mating between close relatives. Often a necessity if the population is small
3.5 Problem: Endogamy
3.5.1 Marrying within a group

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