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Sexual Selection
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Sexual Selection


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  • Primary characteristics:Organs needed for reproduction (sexual organs)
  • Transcript

    • 1. Sexual Selection
      By: Angela, Sarah, and Saima
    • 2. Sexual selection goes both ways
      Makes organisms go to extremes
      Selection types: Male competition and Female Choice
      Runaway selection
      Sexual dimorphism
      Evolution and changes
      Sexual Selection
    • 3. Better survival chances for offspring
      Weaker genes are eliminated – not chosen to reproduce
      Produce offspring
      Purpose of Sexual Selection
    • 4. Intrasexual selection
      Male goes for extreme competition for mate
      Secondary characteristics are used for mate competition
      Characteristics that are not mandatory for breeding
      Male Competition
      Elephant mating
    • 5. Intersexual selection
      Pick mates to increase the survival of its offspring
      Compare the secondary characteristic in male
      Females pick their mates based on their looks, situation, and behaviour.
      Female Choice
      TragopanSatyar Video
    • 6. The differences in male and female of the same species
      Males often have more deleterious characters
      Characteristics that reduce survival chances
      Sexual Dimorphism
    • 7. A.k.a. arbitrary sexual selection
      Developed by Sir Ronald Aylmer Fisher
      Female’s choice cause deleterious characteristic development in males
      Change in male characteristics doesn’t equal to higher quality
      Runaway Selection
    • 8. Anagenesis occurs due to Female choices
      Changes that occur within a species overtime
      Sensory Exploitation
      Harmful characteristics evolve in males to attract female – fulfill reproductive needs
      i.e. Long, bright colour tails
    • 9. Anderson WT. Evolution isn’t what is used to be. New York, NY: W. H. Freeman and Company, c1996.
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      Gamlin L. Eyewitness Science: Evolution. Toronto, ON: Stoddart Publishing, c1993.
      Gamlin L and Vines G. The evolution of life. New York: Oxford University Press, c1991.
      "Human evolution theory founded on female sexual selection and neoteny addressing autism, female infanticide, biological and cultural evolution.." Human evolution theory founded on female sexual selection and neoteny addressing autism, female infanticide, biological and cultural evolution. Web. 20 May 2010. <>
      "Mate Choice and sexual selection: what have we learnt since Darwin?." Web. 20 May 2010. <>
      Males, the more ornamented. "Charles Darwin - Descent of Man - Chapter 8." Secular Web: Atheism, Agnosticism, Naturalism, Skepticism and Secularism. Web. 20 May 2010. <>
    • 10. "Natural Selection and Sexual Selection." Aquatic Ape Theory (AAT): Sink or Swim?. Web. 20 May 2010. <>
      "PLoS ONE: Sexual Selection and the Evolution of Brain Size in Primates." PLoS ONE : accelerating the publication of peer-reviewed science. N.p., n.d. Web. 20 May 2010. <>.
      Ridley M. Evolution 2nd ed. Atlanta, Georgia: Department of Anthropology and Biology – Emory University, c1996.
      Sexual selection [Internet]. Evolution 101 [cited 21 May 2010]. Available from:
      "Sexual Selection." Stanford University. N.p., n.d. Web. 20 May 2010. <>
      Templeton AR. Evolution. The World Book Encyclopedia-E. Chicago: World Book, c2007.
      Wyhe, John van. "Charles Darwin & Evolution." Christ's College - University of Cambridge. N.p., n.d. Web. 20 May 2010.