Sexual Selection

Sexual Selection
By: Angela, Sarah, and Saima

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

Better survival chances for offspring
Weaker genes are eliminated – not chosen to reproduce
Produce offspring
Purpose of Sexual Selection

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

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

The differences in male and female of the same species
Males often have more deleterious characters
Characteristics that reduce survival chances
Sexual Dimorphism

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

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
Evolution

Anderson WT. Evolution isn’t what is used to be. New York, NY: W. H. Freeman and Company, c1996.
"Edge: SEXUAL SELECTION AND THE MIND." EDGE. Web. 20 May 2010. <http://www.edge.org/3rd_culture
"Evolution 101: Sexual Selection." Understanding Evolution. Web. 20 May 2010. <http://evolution.berkeley.edu/
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. <http://www.serpentfd.org/.>
"Mate Choice and sexual selection: what have we learnt since Darwin?." pnas.org. Web. 20 May 2010. <www.pnas.org/content/106/supply.com.>
Males, the more ornamented. "Charles Darwin - Descent of Man - Chapter 8." Secular Web: Atheism, Agnosticism, Naturalism, Skepticism and Secularism. Web. 20 May 2010. <http://www.infidels.org/library/.>
Bibliography

"Natural Selection and Sexual Selection." Aquatic Ape Theory (AAT): Sink or Swim?. Web. 20 May 2010. <http://www.aquaticape.org/sexualselection.>
"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. <http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0000062>.
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: http://evolution.berkeley.edu/evosite/evo101/IIIE3Sexualselection.shtml
"Sexual Selection." Stanford University. N.p., n.d. Web. 20 May 2010. <http://www.stanford.edu/group/.>
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. http://www.christs.cam.ac.uk/darwin200/pages/index.php?page_id=d4.
Bibliography

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Sexual Selection

by Nick on Jun 12, 2010

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