Lecture3-25Jan

Lecture3-25Jan - Forty-six & 2 -Tool Announcements:...

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1 Forty-six & 2 -Tool Announcements: Announcements: • Labs start next week Labs start next week • Incompletes Incompletes …see me see me • SSD sessions start next week SSD sessions start next week • SSD instructors will be on Blackboard SSD instructors will be on Blackboard • Mon 7 Mon 7 -8 • Tues 9 Tues 9 -10 10 • Wed 10 Wed 10 -11 11 H-W assumptions W assumptions • No mutation • Mating is random • No migration (in or out) • Population is infinitely large • No natural selection ……only the laws of probability
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2 H-W: W: no mutations? no mutations? • Mutations : due to accidents in DNA – Happen all the time, but slowly • Source of all genetic variation – Required for evolution next generation? next generation? H-W: W: random mating? random mating? • Some species seem to mate at random…. – E.g., Salmon Many sessile reef animals just release their gametes into the water….all at the same time.
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3 But even these examples are not truly random. The size of populations precludes random mating (isolation by distance). So population size and random mating are at odds. Many organisms show clear forms of mate selection (non-random mating). Non Non -random mating: examples random mating: examples Non Non -random mating: examples random mating: examples • Male competition, for territories or mates Fighting Vocalization Ornamentation
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4 Non Non -random mating: examples random mating: examples • Female choice: lekking – Males congregate and display – Females visit and choose mates • One or a few males mate most • E.g., prairie chickens, manakins, cotingas Effects of non Effects of non -random mating: random mating: males females females Offspring allele freqs differ from previous generation next generation H-W:
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Lecture3-25Jan - Forty-six & 2 -Tool Announcements:...

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