{"id":61164,"date":"2022-01-21T15:04:59","date_gmt":"2022-01-21T20:04:59","guid":{"rendered":"https:\/\/world.edu\/?p=61164"},"modified":"2022-01-21T15:04:59","modified_gmt":"2022-01-21T20:04:59","slug":"evolution-how-victorian-sexism-influenced-darwins-theories-new-research","status":"publish","type":"post","link":"https:\/\/world.edu\/evolution-how-victorian-sexism-influenced-darwins-theories-new-research\/","title":{"rendered":"Evolution: how Victorian sexism influenced Darwin\u2019s theories \u2013 new research"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/evolution.jpeg\" alt=\"\" width=\"680\" height=\"340\" class=\"aligncenter size-full wp-image-61165\" srcset=\"https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/evolution.jpeg 680w, https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/evolution-250x125.jpeg 250w\" sizes=\"(max-width: 680px) 100vw, 680px\" \/><br \/>\nSex is an expensive business, biologically speaking. Finding a suitable mate takes time and energy. Offspring are also a huge investment of resources. But sex does offer a rewarding possibility: children who are fitter than their parents thanks to new and \u201cbetter\u201d combinations of genes. Darwin realised that many animal species therefore carefully select their mates.<\/p>\n<p>There is an innate biological inequality, however. Eggs are relatively few in number \u2013 a large and costly investment \u2013 while sperm are small and vastly more abundant. And embryos often need further investment in the body or outside. Since the greater investment tends to fall on females, they are often the more selective sex (while males compete to be chosen).<\/p>\n<p>But according to a new paper,\u00a0<a href=\"http:\/\/www.science.org\/doi\/10.1126\/science.abi6308\">published in Science<\/a>, Charles Darwin\u2019s patriarchal world view led him to dismiss female agency and mate choice in humans.<\/p>\n<p>He also downplayed the role of female variation in other animal species, assuming they were rather uniform, and always made similar decisions. And he thought there was enormous variation among the males who battled for female attention by showing off stunning ranges of skills and beauty. This maintained the focus on the dynamics of male dominance hierarchies, sexual ornamentation and variation as drivers of sexual selection, even if females sometimes did the choosing.<\/p>\n<p>But do Darwin\u2019s ideas on sexual selection hold up today?<br \/>\n<div id=\"attachment_61166\" style=\"width: 690px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-61166\" src=\"https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/pipefish.jpeg\" alt=\"\" width=\"680\" height=\"455\" class=\"size-full wp-image-61166\" srcset=\"https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/pipefish.jpeg 680w, https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/pipefish-250x167.jpeg 250w\" sizes=\"(max-width: 680px) 100vw, 680px\" \/><p id=\"caption-attachment-61166\" class=\"wp-caption-text\">Male ringed pipefish carry the eggs until they hatch. Fran\u00e7ois Libert\/flickr<\/p><\/div><\/p>\n<h4><strong>Complex choices<\/strong><\/h4>\n<p>When animals choose a partner, their appearance, sound and smell can all be accurate guides to the survival ability of the prospective mate. For example, large antlers in deer are a good indicator of fighting ability, dominance and overall fitness. But many other traits can be chosen because they are otherwise conspicuous and attractive yet may be a poor guide to overall genetic quality, or even misleading.<\/p>\n<p>Females may evolve to choose mates with whom\u00a0<a href=\"https:\/\/www.jstor.org\/stable\/2460199\">their offspring are less likely to survive<\/a>, provided there are more such offspring as a trade off. In some species of poecilid fish, for example, male attractiveness is linked to genes that can reduce their survival. Females therefore face a dilemma: mate with a more attractive male and produce some highly attractive but otherwise less vigorous sons, or mate with a less attractive male to maximise the survival of those sons. Which strategy will produce most grandchildren?<\/p>\n<p>Females may therefore select for traits in males that apparently have no other bearing upon their ability to survive. The peacock\u2019s tail is a handicap in most other aspects of its life \u2013 an impediment to flight and evading predators \u2013 save for the attraction of a female. However, it may also be true that the ability of a male to manage such a burden\u00a0<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/0022519375901113\">is itself a marker<\/a>\u00a0of overall genetic quality and rigour.<br \/>\n<div id=\"attachment_61167\" style=\"width: 690px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-61167\" src=\"https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/darwin.jpeg\" alt=\"\" width=\"680\" height=\"492\" class=\"size-full wp-image-61167\" srcset=\"https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/darwin.jpeg 680w, https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/darwin-250x181.jpeg 250w\" sizes=\"(max-width: 680px) 100vw, 680px\" \/><p id=\"caption-attachment-61167\" class=\"wp-caption-text\">Darwin, Natural History Museum. London. Shutterstock<\/p><\/div><\/p>\n<p>It isn\u2019t always females who choose. In pipefishes, the males invest heavily by carrying the fertilised eggs until they hatch, and it is the females who compete with each other in order to secure the attentions of males.<\/p>\n<p>Optimal mate choice is not the same for all individuals, or at all times in their development. For example, younger satin bowerbirds are frightened by the most vigorous male displays, while older females typically find these most attractive. And many fishes are sequential hermaphrodites, changing sex \u2013 and therefore mate choices \u2013 as they age.<\/p>\n<p>Research since Darwin therefore reveals that mate choice is a far more complex process than he may have supposed, and is governed by variation in both sexes.<\/p>\n<h4><strong>Was Darwin a sexist?<\/strong><\/h4>\n<p>So, is the accusation of sexism levelled at Darwin really valid, and did this cloud his science? There is certainly some evidence that Darwin underestimated the importance of variation, strategy and even promiscuity in most female animals.<\/p>\n<p>For example, Darwin &#8211; possibly as a result of a prevailing prudishness &#8211; placed little emphasis on mechanisms of sexual selection that operate\u00a0<em>after<\/em>\u00a0mating. Female birds and mammals may choose to mate with multiple males, and their sperm can compete to fertilise one or more eggs within the reproductive tract.<\/p>\n<p>Cats, dogs and other animals can have litters with multiple fathers (the gloriously named \u201c<a href=\"https:\/\/www.theguardian.com\/lifeandstyle\/shortcuts\/2018\/dec\/11\/one-set-twins-two-fathers-how-common-is-superfecundation\">heteropaternal superfecundation<\/a>\u201d &#8211; even though the sound of it is really quite atrocious!). There is even some suggestion that the human penis \u2013 being thicker than our nearest primate relatives \u2013 is an adaptation for\u00a0<a href=\"http:\/\/news.bbc.co.uk\/1\/hi\/health\/3128753.stm\">physically displacing the sperm of competing males<\/a>. Such earthy speculations were anathema to Darwin\u2019s sensibilities.<\/p>\n<p>Female blue tits\u00a0<a href=\"https:\/\/www.sciencedaily.com\/releases\/2016\/05\/160530101136.htm\">often mate with multiple males<\/a>\u00a0in order to ensure their protection and support &#8211; a somewhat manipulative strategy when paternity for the prospective fathers is uncertain. All this challenges Darwin\u2019s assumption that females are relatively passive and non-strategic.<\/p>\n<p>Where males make a greater investment, they become more active in mate choice. Male (rather than female) poison dart frogs (<em>Dendrobates auratus<\/em>) protect the young, and therefore attract multiple females who compete to lay eggs for them to fertilise. Many bird species have biparental care, and therefore a richer diversity of mating systems.<br \/>\n<div id=\"attachment_61168\" style=\"width: 690px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-61168\" src=\"https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/poisondartfrog.jpeg\" alt=\"\" width=\"680\" height=\"364\" class=\"size-full wp-image-61168\" srcset=\"https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/poisondartfrog.jpeg 680w, https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/poisondartfrog-250x134.jpeg 250w\" sizes=\"(max-width: 680px) 100vw, 680px\" \/><p id=\"caption-attachment-61168\" class=\"wp-caption-text\">Dendrobates auratus, a poison dart frog. Brian Gratwicke\/flickr<\/p><\/div><\/p>\n<p>Inevitably, Darwin\u2019s world view was shaped by the culture of his time, and his personal writings make it difficult to mount a particularly robust defence.\u00a0<a href=\"https:\/\/www.darwinproject.ac.uk\/letter\/DCP-LETT-13607.xml\">In a letter from 1882, he wrote<\/a>\u00a0\u201cI certainly think that women, though generally superior to men to [sic] moral qualities are inferior intellectually; &amp; there seems to me to be a great difficulty from the laws of inheritance \u2026 in their becoming the intellectual equals of man\u201d.<\/p>\n<p>He also deliberated over the relative merits of marriage,\u00a0<a href=\"https:\/\/www.darwinproject.ac.uk\/tags\/about-darwin\/family-life\/darwin-marriage#\">famously noting<\/a>: \u201cHome, &amp; someone to take care of house \u2014 Charms of music &amp; female chit-chat. \u2014 These things good for one\u2019s health. \u2014 but terrible loss of time\u201d.<\/p>\n<p>Unsurprisingly there is much that Darwin did not fully understand. Darwin \u2013 like Albert Einstein, H.G. Wells and Edgar Allan Poe \u2013 married his first cousin, Emma Wedgwood. Ironically, he knew nothing of genetics and the mechanisms by which close relatives are more likely to have offspring with certain genetic diseases. Intriguingly, our closest relatives in the tree of life, the chimpanzees,\u00a0<a href=\"https:\/\/today.duke.edu\/2017\/01\/genetic-opposites-attract-when-chimpanzees-choose-mate\">naturally circumvent this problem<\/a>, since females select mates that are more distantly related to them than the average male in the available pool.<br \/>\n<div id=\"attachment_61169\" style=\"width: 690px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-61169\" src=\"https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/feamalechimp.jpeg\" alt=\"\" width=\"680\" height=\"454\" class=\"size-full wp-image-61169\" srcset=\"https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/feamalechimp.jpeg 680w, https:\/\/world.edu\/wp-content\/uploads\/2022\/01\/feamalechimp-250x167.jpeg 250w\" sizes=\"(max-width: 680px) 100vw, 680px\" \/><p id=\"caption-attachment-61169\" class=\"wp-caption-text\">Female chimpanzees make good choices. Phenix\/PixaHive, CC BY<\/p><\/div><\/p>\n<p>Despite its omissions, however, Darwin\u2019s understanding was\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=s5P4uYsK8_c&amp;t=13s\">radically more advanced than anything that preceded it<\/a>. When combined with the subsequent understanding of genetics and inheritance, Darwin\u2019s writings are still the bedrock of all modern evolutionary biology.<\/p>\n<p><em><strong>Author Bio:<\/strong> Matthew Wills is Professor of Evolutionary Palaeobiology at the Milner Centre for Evolution at the University of Bath<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sex is an expensive business, biologically speaking. Finding a suitable mate takes time and energy. Offspring are also a huge investment of resources. But sex does offer a rewarding possibility: children who are fitter than their parents thanks to new and \u201cbetter\u201d combinations of genes. Darwin realised that many animal species therefore carefully select their [&hellip;]\n&hellip; <a href=\"https:\/\/world.edu\/evolution-how-victorian-sexism-influenced-darwins-theories-new-research\/\" class=\"more\">learn more&rarr;<\/a><\/p>","protected":false},"author":33,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[86115],"tags":[5775],"coauthors":[11733],"class_list":["post-61164","post","type-post","status-publish","format-standard","hentry","category-research","tag-evolution"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Evolution: how Victorian sexism influenced Darwin\u2019s theories \u2013 new research - World leading higher education information and services<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/world.edu\/evolution-how-victorian-sexism-influenced-darwins-theories-new-research\/\" class=\"yoast-seo-meta-tag\" \/>\n<meta property=\"og:locale\" content=\"en_US\" class=\"yoast-seo-meta-tag\" \/>\n<meta property=\"og:type\" content=\"article\" class=\"yoast-seo-meta-tag\" \/>\n<meta property=\"og:title\" content=\"Evolution: how Victorian sexism influenced Darwin\u2019s theories \u2013 new research - World leading higher education information and services\" class=\"yoast-seo-meta-tag\" \/>\n<meta property=\"og:description\" content=\"Sex is an expensive business, biologically speaking. 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