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Lecture notes - March 3

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BIOL 1500
Alexander Mills

BIOLOGY 1001 LECTURES NOTES – March 3, 2014 Lecture 9b – 9c (pg.85) – 9d (pg.85-88, 223-224)  The more mates, the higher the individual’s fitness  The better the mate’s quality, the higher the individual’s fitness  Red-winged blackbirds loses his territory and loses his harem when its wings are turned from orange to black  Males’ mating success is highly variable in many species, and almost always more variable than females  ^ This accounts for much of males’ advertising and fighting  Almost 90% males do not reproduce offspring  Huge variability in male reproductive success and less in females Bateman-Trivers Hypothesis Consequences  Females often produce fewer young in their lifetime compared to males  Her fitness is limited by resources not access to mates  Males fitness is limited by his access to mates but he can sire a limitless number of offspring  Females hit a plateau in reproducing when they mate with a certain number of males whereas males’s fitness continues to increase as they continue to reproduce Natural Selection  The availability of females is finite: st - 1 inference: struggle for repro. Success  There are great genetic rewards for males that succeed because they have higher fitness and more offspring  There are potentially great genetic rewards for females because their offspring are of a higher quality  Sexua
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