LIFESCI 2D03 Lecture Notes - Lecture 5: Sperm Competition, Group Selection, Sexual Selection
24 Sep 2017
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Males mate-guard post-mating with a female to prevent sperm competition from other males. Evolution by natural selection favours adaptations that enhance fitness: evolution the change that occurs; natural selection how that change occurs. Modes of natural selection describe population changes: modes means of accomplishing something. Individual & group selection have been used to explain cooperation. Sexual selection is a for of natural selection that focuses on the reproductive fitness of individuals. Human breeders select individual dogs based on the trait they possess. Certain breeds have favoured traits: retrievers good at finding + retrieving animals/objects; grey hounds quick. Mechanism that explains the differences we see in different dog breeds. Human manipulation selection for particular traits change. Charles robert darwin & alfred russel wallace naturalists (observe animals around the world. & document differences think about mechanisms that caused the difference in behaviour and appearance in different habitats: caught up in idea that you can have related animals with suttle differences in traits.
