ANT1Lecture2

ANT1Lecture2 - Anthropology 1 – Winter 2008 Human...

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Unformatted text preview: Anthropology 1 – Winter 2008 Human Evolutionary Biology Partitioning Variation Women’s basketball team Height range 5’6” to 6’1” Women’s gymnastics team Height range 4’11” to 5’7” Mean 5’10” Mean 5’3” Total amount of height range 4’11” to 6’1” Human Genetic Variation Within Group Variation 85%-95% Total Variation ‣ Heights of men joining the British army in 1939 ‣ Tallest about 7 ft. ‣ Shortest about 5 ft. Gregor Mendel Mendel’s Pea Experiments ‣ Selected peas because they ‣ Mature and produce offspring in a single season ‣ Many varieties with easily distinguished traits Mendel’s Pea Experiments ‣ Focused on traits that have two clear forms (discontinuous variants) ‣ Green/yellow seeds ‣ Smooth/wrinkled seeds ‣ Cultivated true breeding lines and then studied the results of crosses ‣ Kept careful records Mendel Crossed Two True-Breeding Lines ‣ Cross green & yellow parents (F generation) Mendel Crossed Two True-Breeding Lines ‣ Cross green & yellow parents (F generation) ‣ All the offspring were yellow (F 1 generation) Mendel Crossed Two True-Breeding Lines ‣ Cross green & yellow parents (F generation) ‣ All the offspring were yellow (F 1 generation) Mendel Crossed Two True-Breeding Lines Mendel Crossed Two True-Breeding Lines ‣ Then, crossed the offspring Mendel Crossed Two True-Breeding Lines ‣ F 2 generation – 3:1 ratio of yellow to green ‣ Then, crossed the offspring Mendel Crossed Two True-Breeding Lines ‣ F 2 generation – 3:1 ratio of yellow to green ‣ Then, crossed the offspring Mendel Studied Trait Pairs ‣ Smooth-Yellow x Wrinkled- Green cross ‣ F 1 = all Smooth-Yellow ‣ F 2 = 9 SY: 3 SG: 3 WY: 1 WG ‣ New combinations appear (smooth green, wrinkled yellow) To Explain the Pattern of Results, Mendel Inferred Two Laws To Explain the Pattern of Results, Mendel Inferred Two Laws 1. Characteristics of organisms are determined jointly by two “particles”, one inherited from each parent To Explain the Pattern of Results, Mendel Inferred Two Laws 1. Characteristics of organisms are determined jointly by two “particles”, one inherited from...
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This note was uploaded on 04/15/2008 for the course ANT 001 taught by Professor Mchenry during the Winter '08 term at UC Davis.

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ANT1Lecture2 - Anthropology 1 – Winter 2008 Human...

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