{"id":32558,"date":"2021-04-22T10:10:05","date_gmt":"2021-04-22T14:10:05","guid":{"rendered":"https:\/\/www.shortform.com\/blog\/?p=32558"},"modified":"2021-04-23T14:19:24","modified_gmt":"2021-04-23T18:19:24","slug":"evolutionary-hypotheses","status":"publish","type":"post","link":"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/","title":{"rendered":"Evolutionary Hypotheses and the Adaptationist Program"},"content":{"rendered":"\n<p>How do scientists come up with evolutionary hypotheses? What is the adaptationist program?<\/p>\n\n\n\n<p>Proper evolutionary reasoning undertakes the adaptationist program, which is a method of investigation that essentially makes hypotheses testable. This method can be used to help make important medical discoveries.<\/p>\n\n\n\n<p>Keep reading for more on evolutionary hypotheses and the adaptationist program.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Evolutionary Hypotheses<\/strong><\/h2>\n\n\n\n<p><strong>Good evolutionary hypotheses are testable and stand up to reason.<\/strong> Many speculations on traits and behavior don\u2019t meet this criteria. Consider these superficially justifiable explanations that break down under scrutiny:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u201cWe developed our nose structure to hold up glasses.\u201d This can\u2019t be right, because we had noses a long time before we had eyeglasses.<\/li><li>\u201cCrying as an infant is useful to exercise their lungs.\u201d But there\u2019s no evidence that infants who cry end up with healthier lungs as an adult than infants who don\u2019t cry.<\/li><li>\u201cHumans die age 100 to make room for new individuals.\u201d But, as we discussed, <a href=\"https:\/\/www.shortform.com\/blog\/group-selection\/\">group selection<\/a> doesn\u2019t happen.&nbsp;<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The Adaptationist Program<\/strong><\/h3>\n\n\n\n<p>Proper evolutionary reasoning undertakes the \u201cadaptationist program,\u201d which is a method of investigation that essentially makes hypotheses testable.<\/p>\n\n\n\n<p><strong>If you understand the functional significance of some piece of human biology, you should be able to predict other unknown aspects, then investigate to confirm whether they are there or not.<\/strong><\/p>\n\n\n\n<p>For example, consider a species of bird who may lay between 3-5 eggs each mating season. One might naively think that the exact number happens merely by chance. Instead, consider that the individual bird lays a different number of eggs each season to maximize her individual reproductive success\u2014the bird only lays as many eggs as she feels fit to provide for. This would predict that if you found birds who laid 3 eggs, then added an egg to those nests, the offspring would be more likely to die than those of birds who naturally lay 4 eggs.<\/p>\n\n\n\n<p>As another example, consider the sex ratio in humans. One might reason that males and females are equally balanced is because the X and Y chromosomes are randomly chosen with equal probability. But this is a proximate explanation that doesn\u2019t explain <em>why<\/em> this is important. The underlying evolutionary reason is that producing the gender that is scarce at any time has the reproductive advantage. Individuals that produce only male offspring will be selected against when females are scarce, and so the genes that predispose to male offspring are selected against. The same logic applies to genes that promote female offspring. Over time, these pressures balance out, so that individuals have genes that produce offspring at equal sex ratio.<\/p>\n\n\n\n<p>The idea here is that a point of view based around <a href=\"https:\/\/www.shortform.com\/blog\/natural-selection-in-evolution\/\">natural selection<\/a> can help make important medical discoveries. <a href=\"https:\/\/www.shortform.com\/blog\/evolutionary-medicine\/\">Darwinian medicine<\/a> asks questions such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Is this trait of human biology adaptive?<\/li><li>What does the rest of the machinery look like? How can we test our predictions for this machinery?<\/li><li>If this trait seems undesirable, how could natural selection have allowed it to persist? Is the undesirable aspect the price of a hidden beneficial aspect?<\/li><li>Could the trait have been helpful during the Stone Age, and only causes disease in modern times?<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>How do scientists come up with evolutionary hypotheses? What is the adaptationist program? Proper evolutionary reasoning undertakes the adaptationist program, which is a method of investigation that essentially makes hypotheses testable. This method can be used to help make important medical discoveries. Keep reading for more on evolutionary hypotheses and the adaptationist program.<\/p>\n","protected":false},"author":8,"featured_media":32570,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[16,160],"tags":[265],"class_list":["post-32558","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-health","category-science","tag-why-we-get-sick","","tg-column-two"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.3 (Yoast SEO v24.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Evolutionary Hypotheses and the Adaptationist Program - Shortform Books<\/title>\n<meta name=\"description\" content=\"How are evolutionary hypotheses made? Proper evolutionary reasoning undertakes the adaptationist program. 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Learn more about it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/\" \/>\n<meta property=\"og:site_name\" content=\"Shortform Books\" \/>\n<meta property=\"article:published_time\" content=\"2021-04-22T14:10:05+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-04-23T18:19:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/s3.amazonaws.com\/wordpress.shortform.com\/blog\/wp-content\/uploads\/2021\/04\/bird-nest.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1087\" \/>\n\t<meta property=\"og:image:height\" content=\"682\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Hannah Aster\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Hannah Aster\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/\"},\"author\":{\"name\":\"Hannah Aster\",\"@id\":\"https:\/\/www.shortform.com\/blog\/#\/schema\/person\/f39f52830e4f7039a16e45d12354542f\"},\"headline\":\"Evolutionary Hypotheses and the Adaptationist Program\",\"datePublished\":\"2021-04-22T14:10:05+00:00\",\"dateModified\":\"2021-04-23T18:19:24+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/\"},\"wordCount\":528,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.shortform.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.shortform.com\/blog\/wp-content\/uploads\/2021\/04\/bird-nest.jpg\",\"keywords\":[\"Why We Get Sick\"],\"articleSection\":[\"Health\",\"Science\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/\",\"url\":\"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/\",\"name\":\"Evolutionary Hypotheses and the Adaptationist Program - Shortform Books\",\"isPartOf\":{\"@id\":\"https:\/\/www.shortform.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.shortform.com\/blog\/evolutionary-hypotheses\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.shortform.com\/blog\/wp-content\/uploads\/2021\/04\/bird-nest.jpg\",\"datePublished\":\"2021-04-22T14:10:05+00:00\",\"dateModified\":\"2021-04-23T18:19:24+00:00\",\"description\":\"How are evolutionary hypotheses made? 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