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Sexual selection is explained.

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These questions relate to various interesting aspects of animal mating systems that result in sexual selection. Both males and females of many species can preferentially control fertilization. The mechanisms employed can occur before mating (pre-mating mechanisms) or after (post mating mechanisms).

Question 1)

Males typically control fertilization of a female's eggs through sperm competition mechanisms (see http://oregonstate.edu/~arnoldst/pdf_files/Jones%20et%20al_2002.pdf and http://euplotes.biology.uiowa.edu/web/sexpapers/2004/week12/choosyfemales.pdf
for further information.).

One such mechanism is called sperm precedence. In this process, males possess structures and/or behaviours that can result in preferential fertilization of a female's eggs by their own sperm, rather than that of another male, in species where females have multiple mating partners in one season. One way to bias fertilization in one's favour is to produce more sperm per ejaculate volume than other males (see http://beheco.oxfordjournals.org/cgi/content/full/10/4/358). A ...

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This job addresses sexual selection.

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Natural selection & sexual selection

1. Explain with examples how the process of natural selection & sexual selection are thought to have contributed to modern day human behaviour.

2. Describe what is meant by the terms natural & sexual selection.

Examples needed that relate to modern human behaviour. There should be at least 1 example of natural selection which is worked through in detail showing how it relates to modern human behaviour, there should be 1 example of sexual selection related to a different behaviour. Behaviour can include everything people can experience or do - experience, emotions, moods or cognitive states aswell as acting in particular ways.Explore the term contributed!! If you choose to use the theory of mind as an eg you will need to concentrate on explain its evolution rather than describing research that investigates its development in children


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