BIOL208 Lecture Notes - Sexual Conflict, Handicap Principle, Polygynandry

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Biol 208 (january 29, 2014: mating systems and sexual selections, sexual reproduction. It"s not pure cost there are huge benefits: there is the potential of choosing mates. Lots of organisms can reproduce both asexually and sexually: hermaphrodism: is common in plants (~75% are hermaphrodites) and uncommon in animals , uncommon in animals . Because animals can move and seek mates: mating systems. Sexual relationships between individuals of same species exclusive (behaviour observed: genetic monogamy. Offspring is genetically related to both parents. Not common (ex. cheating is prevalent: proven through gene sequencing. Polyandry: 1 female, multiple males, not common, found in prairie chickens, some insects. Polygynandry: multiple males and females, thought to be the rarest now it is known to be the most common, sexual selection. Peahens pick peacocks based on their feather display: morphological preference, indicator of health. Is the appearance an accurate representation of the health of future offspring. Handicap principle: compensation for weaknesses , intrasexual vs. intersexual selection.

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