Vitalistic manipulation impacts sexual selection

See:

http://www.physorg.com/news/2011-09-mothers-subdue-show-off-sons.html

Article reads: The gaudy plumage and acrobatic displays of birds of paradise are a striking example of sexual selection, Charles Darwin’s second great theory of evolution. But new research shows that this powerful process may collapse when mothers can decide whether to have a son or a daughter.

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