17 Doing it, Comparatively Key Terms and Concepts oSecret knock hypothesis oSpontaneous ovulation oInduced ovulation oImplantation oCryptic sexual selection oMate choice oSingle male mating systems oDispersed monogamy oSingle male polygyny oColonial monogamy oPromiscuity oScramble competition oAllometry oTesticular quotient oSperm competition oFirst- vs. last-male advantage oSperm lottery oVaginal plug oSeminal fluid oFemale sequestration oSexual jealousy oAnovulatory estrus oCopulatory pattern The union of male and female gametes can take place externally, as it does in many amphibians and fish that release their eggs and sperm into the water, or it can occur internally as it does in mammals, birds, and many fish and insects. Both forms require precisely timed movement patterns to assure that fertilization occurs. This lesson will focus on the copulatory behavior of mammals. We will begin by describing the various movement patterns involved in copulation and how these patterns vary among species. Then we will review ideas concerning the reasons for the enormous variability that exists. Lesson 17 199
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