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So males with sensory structures that can better detect female signals may have the edge in finding them in order to mate and pass on their genes. Darwin's ideas on sexual selection were met with scepticism by his contemporaries and not considered of great importance in the early 20th century, until in the s biologists decided to include sexual selection as a mode of natural selection. Within this window of opportunity there is a 6-day period during which conception is most likely Dunson et al. As formulated in Bateman's principle, females have a greater initial investment in producing offspring pregnancy in mammals or the production of the egg in birds and reptiles , and this difference in initial investment creates differences in variance in expected reproductive success and bootstraps the sexual selection processes. These include cuckoldry , nuptial gifts, sperm competition , infanticide especially in primates , physical beauty , mating by subterfuge, species isolation mechanisms, male parental care, ambiparental care, mate location, polygamy, and homosexual rape in certain male animals. Experiments involving administration of antioxidants to these males led to the conclusion that breeding coloration is a reflection of innate anti-oxidation capacity that protects against oxidative damage , including oxidative DNA damage.
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