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Lecture 7

Lecture 7.doc

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Ben Evans

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Dr.QuinnsLecture7 Slide2 -shows four different haplotypes (chunks of dna that travel together that are identical) -there is a favorable mutation, that it just came recently -after natural selection has brought the mutation in, you see identical haplotypes, there is a high frequency of this haplotype -over time at the end of the 10000 point, recombination going on, exhange of dna going on, this haplotype will be lost, they will all be different from each other -you cant recognize that this dna went through selection sweep slide3 -summary of what he was talking about, at the bottom -detection of the haplotype surrounding the beneficial mutation -the mutation was at high frequency, and then got lost after recombination slide4 -looking at dairying cow, and how it affected the distribution of lactose malabsorption -case of selective sweep slide5 -look at the pop, 90% of ppl have LM, and 22% of the pop measured to have this statisticc -some population, have a small amount that have LM, 7%. -some populations, that do not have a problem drinking milk, and some that do slide6 -all dots represent different populations -small dots= people who do not have LM -the large dots = people who do have LM (have issues digesting milk) slide7 -mean latitude against LM frequency -people that live near the equator have high rates of LM -people that live far away from the equator have low rates of LM -only two exceptions: greenland and siberia, they have high even though they live in north cause they cant raise the cattle, cause they die of the cold -mean temperature against LM -the lower temp, the less likely you are to have LM -at high temp, more LM -coorelation: near equator + more temp -away from equator + less temp -first two graphs are connected -last graph: number of cattle diseases with LM -fewer diseases, fewer people have LM (dont have issues), these are areas with a lot of cattle, so they do not have issues -more diseases, more people have LM, cause these areas there are not a lot of cattle slide8 -LM is found in low latitudes, high temp, and areas with alot of cattle -barriers to darying seem to explain patterns of LM -culture driving evolution of changing dna patterns -organic evolution is driven by culture change -evolved charecterists taht may change cultures Question the evolution of lactase persistence in africa and europe are the result of a) convergentevolution b) drift acting on the isolated populations c) gene flow between african and europeans (LIKELY) d) the retention of an ancestral trait Slide11 -contors in skin color -skin color has to do with latitude with a large extent -darkest skin is near equator, and lighter away from equator -northern europeans are the most white cause they get no sun and nasty winters -lapps and inuits are a bit darker and get lots of vitamin d through their diet of fish, this is a supp, for it since they live in the north and get no sun slide12 -race is thought to be a skin color -contours of genetic similarity from 42 human populations -doesnt show the pattern of skin color -this is from east to west -general east to west gradient slide13 -both maps Question slide14 -answer: c: selective sweep slide16 -evolutionary psychology -humans have evolved for a long time, that evolution shaped our brain under certain conditions, which is important for our behavior -there is clearly a genetic stamp for evolutionary -but the conditions that cause our brains to change also affect our behavior -look for behavior patterns that cross when it comes to culture -30000-40000 years: our brain has been changing -we think/behave because of the changes -food sharing was essential--> form of altruistic behavior slide17 -the environment of evolutionary adaptedness -most of our history is in small bands of hunters and foragers -human behavior was shaped with our brains as we were hunters and foragers -complex behavior have evolved over time -its not surprising that you see behaviors that dont make sense, thats because they have evolved from the past slide18 -genetic constraints limit or shape learning -classical types of learning affected by genetics -our brains are designed to solve problems that our ancestors faced when they lived in small bands hunting--> here they controlled fire, had home bases, have social contracts with the same ppl--> shared food, shared cultural beliefs -they were in a position where since they are
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