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Lab 8 - Lab Eight Population Genetics and Evolution Lindle...

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Lab Eight Population Genetics and Evolution Lindle 1 Introduction: In a population of the Flying Howler Bears there is a very specific trait that sticks out. The color of the irises in the FHBs are prominent and fluctuate between two colors. The allele for pink irises is re- cessive, denoted by ‘aa’, while the allele for green irises is dominant, denoted by AA. The population of the FHBs is made up of 100,000 individuals. 50,000 FHBs have the recessive pink eye trait while 50,000 are homozygous dominant. The genotype Aa results in an abortion. In order to maintain this population of FHBs, five conditions must be met. P=.5 Q=.5 THE HARDY-WEINBERG LAWS If Conditions Are Not Met No Mutations With the addition of this new eye color, phen- otypes within the population would change from two to three. AA would be Green, Aa would be brown eyes, and aa would be pink. Over time, the genotypes sway into a forma- tion where all of the FHB do not have eyes. After numerous generations, 30,000 are aa, 40,000 are AA and 30,000 are Aa.P=.55 Q=.45 When this condition is not met, the gene pool will shift. Let’s say for example a FHB was born with a mutation resulting in brown eyes and it was denoted by Aa, which before resul- ted in abortion. No Migration/Emigration them have two recessive alleles. This will taint the gene pool of the original FHBs. 100,000 now have the recessive aa, and 50,000 now have the dominant AA. P= .333 Q=.667 When this condition is not met, the gene pool will shift. Let’s say for example 50,000 FHBs from another portion of the world travels to
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