Biology 2483A Lecture Notes - Lecture 6: Greater Prairie Chicken, Trophy Hunting, Allele Frequency

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Trophy hunting and inadvertent evolution: a case study. Bighorn sheep populations have been reduced by 90% by hunting, habitat loss, and introduction of cattle. Hunting is now restricted; permits for a large trophy ram cost over. Trophy hunting removes the largest and strongest males the ones that would sire many healthy offspring. In one population, 10% of males were removed by hunting each year, the average size of males and their horns decreased over 30 years of study. Commercial harvesting takes the largest individuals, which are all females. Genes for switching sex at a smaller size became more common, resulting in more females, but smaller females lay fewer eggs. Evolution can be viewed as genetic change over time or as a process of descent with modification. Biological evolution is change in organisms over time. Evolution can be defined more broadly as descent with modification.

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