CHDV 23249 Lecture Notes - Lecture 11: Scramble Competition, Oogenesis, Ovulation
1 Feb 2017
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Document Summary
Sperm competition: male-male competition post-mating females can mate with multiple males. One male fertilizes a disproportionate number of eggs females may be able to store sperm (in some species) Fertilization of eggs: 1st male has the advantage. Mate-guarding: preventing future copulations from occurring, males prevent other males from approaching female, vice versa, costs to the males: time could be spent finding additional males time could be spent looking for food risk of physical injury. Copulatory plugs immediately after copulation: physically blocks the transfer of sperm by other males (guinea pigs) "antiaphrodisiacs: stimulation of ovulation, stimulation of oogenesis. Fertilization of eggs: last male has the advantage removal of previous male"s sperm repeated copulation. Non-fertilizing sperm: displacement of other male"s sperm size or amount of sperm, drosophila has biggest sperm size relative to body size, number of sperm length of copulation. Morphological differences between males in monogamous, and multiple mate system.
