Biology 1001A Lecture Notes - Lecture 16: Anisogamy, Frequency-Dependent Selection, Sexual Reproduction
23 Jun 2015
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Lecture 16 : sex continued, sexual selection: meaning of monogamy, polygamy, polygyny, polyandry, promiscuity, and lek. Monogamy: male and female form a pair bond for mating season, or even for a lifetime. Polygamy: males and females having multiple partners; mating with more than one individual of the opposite sex. Polygyny: male who has active pair bonds with more than one female, contributing only sperm and no parental role. Polyandry: female who has active pair bonds with more than one male, contributing only eggs and no parental role. Promiscuity: when males and females have no pair bonds beyond the time it takes to mate. Leks: congregations of displaying males where females go only to mate: conditions favouring the evolution of monogamous vs. polygamous mating systems. When the offspring require thorough care that both parents can provide, monogamy often prevails. For example, songbirds are helpless when they hatch. They need food that both parents can bring to them.
