BIOL 3040 Chapter : Chapter 1 Objectives
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By increasing the competition with more sperm donators, the sperm investment steadily increased as the amount of competitors increased: describe fisher"s sex-ratio model and what it predicts about sex ratios in nature. In sex ratios, whenever one sex becomes less common than the other, the opposite sex becomes more valuable and the genes for producing that sex spread and births of that sex become more common. As the 1:1 sex ratio is approached, the advantage associated with that sex dies off and the ratio is kept: describe the study by charlat et al. which examined sex ratios of butterflies on the samoan. Islands: 99% of the butterflies were female and 1% were male due to the bacterium wolbachia. When a mutant arose and males were resistant to the bacterium, the 1:1 sex ratio was restored in 5 years. From the paper by palumbi (2001) list the three general mechanisms that work to slow evolution and give examples of each.
