Lec 17 - BIS2B Fall 2009 (Keen) Lecture 17. More on...

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BIS2B Fall 2009 (Keen) Lecture 17 . More on Population Genetics !" $%&’()* +,&)*-’’- %./00 12’./&2’-0 ’, &3) /00456&2’-0 ’, 78 )942.2(*245 :&4;)-&0 03’4.; () /(.) &’< 6*);2%& &3) ),,)%&0 ’, =2’./&2’-0 ’, &3) > %’-;2&2’-0 ,’* 78 ’- &3) ’(0)*=); ?)-’&@62% ,*)94)-%2)0A 6*);2%& &3) ),,)%&0 ’, -/&4*/. 0).)%&2’- ’- ;20%*)&) /-; 94/-&2&/&2=) &*/2& ;20&*2(4&2’-0 2- ,4&4*) ?)-)*/&2’-0B C2&3 06)%2/. *),)*)-%) &’ &3) 5)/- /-; =/*2/-%) ’, 94/-&2&/&2=) &*/2& ;20&*2(4&2’-0A
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Fitness is measured on individuals , but we see evolution as gene frequency change within populations across generations. Individuals do not evolve, populations evolve.
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The observed frequencies from the data set in the last lecture were: f (YY) = 0.48 , f (Yy) = 0.24, f (yy) = 0.28 Make a table: f (YY) f (Yy) f (yy) Expected Observed Departures excess YY heterozygote deficiency excess yy .48 . 24 . 28 .36 . 48 .16
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Which violations could cause this? In diploid organisms, gene/allelic frequencies & In diploid organisms, gene/allelic frequencies & genotypic ratios in large genotypic ratios in large biparental populations populations reach an equilibrium in 1 generation, and remain reach an equilibrium in 1 generation, and remain constant thereafter, when constant thereafter, when 1. large population size (no genetic drift) 2. no migration (gene flow from other populations 3. no mutations 4. random mating 5. no advantages to alleles (natural selection) SO: what about small population size and genetic drift, gene flow, mutations, non- random mating and natural selection? What effect will they have?
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Which violations could cause this?
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This note was uploaded on 04/21/2010 for the course BIS 2C BIS 2C taught by Professor Rizzo during the Winter '09 term at UC Davis.

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Lec 17 - BIS2B Fall 2009 (Keen) Lecture 17. More on...

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