Darwin Day Special! What is Sexual Selection?

Darwin was born 210 years ago! Among the many things he discovered is a special process called Sexual Selection. What is Sexual Selection and how does it work?

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SOURCES

Studies linking mutations to sexual preferences (keep in mind, these are correlations, full causal details are not yet understood):
https://www.pnas.org/content/101/17/6758
http://science.sciencemag.org/content/261/5119/321.long

Spider group with females that have evolved gigantism, apparently to avoid sexual control by males which attempt to enforce monogamy via genital mutilation after copulation: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&ved=2ahUKEwjLnImJ37bgAhUOW60KHWReB5sQFjAEegQIBRAC&url=http%3A%2F%2Fezlab.zrc-sazu.si%2Fuploads%2F2011%2F05%2FKuntneral2009_MatePluggingNephilidae.pdf&usg=AOvVaw2x7dqqQesuQRR9emibXdjk

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