Evidence of intralocus sexual conflict: physically and hormonally masculine individuals have more attractive brothers relative to sisters
Abstract Intralocus sexual conflict (IASC) occurs when sex-specific selection favors genes that increase fitness in one sex and decrease fitness in the other sex. The current study was designed to explore whether IASC occurs in humans. In a sample of siblings, we identified and measured sexually dim...
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| Veröffentlicht in: | Evolution and human behavior 2011-11, Vol.32 (6), p.423-432 |
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| creator | Garver-Apgar, Christine E Eaton, Melissa A Tybur, Joshua M Emery Thompson, Melissa |
| description | Abstract Intralocus sexual conflict (IASC) occurs when sex-specific selection favors genes that increase fitness in one sex and decrease fitness in the other sex. The current study was designed to explore whether IASC occurs in humans. In a sample of siblings, we identified and measured sexually dimorphic traits and hormones within each sex that are related to fitness and are likely coded for by antagonistic genes: waist-to-hip ratio (WHR) and breast size in women, WHR and bicep size (an index of muscularity) in men, and estradiol (E) and testosterone (T) in both sexes. If these traits and hormones are coded for by genes under IASC, masculine or feminine expression of traits and hormones should differentially predict brothers' and sisters' fitness. Consistent with an IASC model, both men and women who were physically masculine for their sex reported higher mate value brothers relative to sisters. Similarly, in normal-weight individuals, E levels positively predicted the mate value of sisters relative to brothers and T levels positively predicted the mate value of brothers relative to sisters. We found no evidence that individuals with indicators of high genetic quality (i.e., physically masculine men and physically feminine women) share high mate value with all siblings, regardless of sibling sex. Results are novel and demonstrate for the first time that intralocus conflict in humans may influence the fitness of related individuals. |
| doi_str_mv | 10.1016/j.evolhumbehav.2011.03.005 |
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The current study was designed to explore whether IASC occurs in humans. In a sample of siblings, we identified and measured sexually dimorphic traits and hormones within each sex that are related to fitness and are likely coded for by antagonistic genes: waist-to-hip ratio (WHR) and breast size in women, WHR and bicep size (an index of muscularity) in men, and estradiol (E) and testosterone (T) in both sexes. If these traits and hormones are coded for by genes under IASC, masculine or feminine expression of traits and hormones should differentially predict brothers' and sisters' fitness. Consistent with an IASC model, both men and women who were physically masculine for their sex reported higher mate value brothers relative to sisters. Similarly, in normal-weight individuals, E levels positively predicted the mate value of sisters relative to brothers and T levels positively predicted the mate value of brothers relative to sisters. We found no evidence that individuals with indicators of high genetic quality (i.e., physically masculine men and physically feminine women) share high mate value with all siblings, regardless of sibling sex. Results are novel and demonstrate for the first time that intralocus conflict in humans may influence the fitness of related individuals.</description><identifier>ISSN: 1090-5138</identifier><identifier>EISSN: 1879-0607</identifier><identifier>DOI: 10.1016/j.evolhumbehav.2011.03.005</identifier><identifier>CODEN: EHBEFF</identifier><language>eng</language><publisher>Elsevier Inc</publisher><subject>Conflict ; Estrogen ; Femininity ; Genetics ; Hormones ; Human behaviour ; Intralocus conflict ; Masculinity ; Psychiatry ; Sex discrimination ; Sexual behaviour ; Sexual dimorphism ; Sexually antagonistic selection ; Siblings ; Testosterone ; Values</subject><ispartof>Evolution and human behavior, 2011-11, Vol.32 (6), p.423-432</ispartof><rights>Elsevier Inc.</rights><rights>2011 Elsevier Inc.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c444t-4718ddde8a39f44d475f4b837f19ec1cd6758fda2cfcf9b210725c77735eaf6c3</citedby><cites>FETCH-LOGICAL-c444t-4718ddde8a39f44d475f4b837f19ec1cd6758fda2cfcf9b210725c77735eaf6c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.evolhumbehav.2011.03.005$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,33775,45995</link.rule.ids></links><search><creatorcontrib>Garver-Apgar, Christine E</creatorcontrib><creatorcontrib>Eaton, Melissa A</creatorcontrib><creatorcontrib>Tybur, Joshua M</creatorcontrib><creatorcontrib>Emery Thompson, Melissa</creatorcontrib><title>Evidence of intralocus sexual conflict: physically and hormonally masculine individuals have more attractive brothers relative to sisters</title><title>Evolution and human behavior</title><description>Abstract Intralocus sexual conflict (IASC) occurs when sex-specific selection favors genes that increase fitness in one sex and decrease fitness in the other sex. The current study was designed to explore whether IASC occurs in humans. In a sample of siblings, we identified and measured sexually dimorphic traits and hormones within each sex that are related to fitness and are likely coded for by antagonistic genes: waist-to-hip ratio (WHR) and breast size in women, WHR and bicep size (an index of muscularity) in men, and estradiol (E) and testosterone (T) in both sexes. If these traits and hormones are coded for by genes under IASC, masculine or feminine expression of traits and hormones should differentially predict brothers' and sisters' fitness. Consistent with an IASC model, both men and women who were physically masculine for their sex reported higher mate value brothers relative to sisters. Similarly, in normal-weight individuals, E levels positively predicted the mate value of sisters relative to brothers and T levels positively predicted the mate value of brothers relative to sisters. We found no evidence that individuals with indicators of high genetic quality (i.e., physically masculine men and physically feminine women) share high mate value with all siblings, regardless of sibling sex. Results are novel and demonstrate for the first time that intralocus conflict in humans may influence the fitness of related individuals.</description><subject>Conflict</subject><subject>Estrogen</subject><subject>Femininity</subject><subject>Genetics</subject><subject>Hormones</subject><subject>Human behaviour</subject><subject>Intralocus conflict</subject><subject>Masculinity</subject><subject>Psychiatry</subject><subject>Sex discrimination</subject><subject>Sexual behaviour</subject><subject>Sexual dimorphism</subject><subject>Sexually antagonistic selection</subject><subject>Siblings</subject><subject>Testosterone</subject><subject>Values</subject><issn>1090-5138</issn><issn>1879-0607</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>BHHNA</sourceid><recordid>eNqNksFu1DAQhiMEEqXwDhYXuCS1YydOekBCpVCkShyAs-W1x4oXJ15sZ8U-Am_NpMsBcUCc7Bn9_6-xv6mql4w2jLL-at_AMYZpnXcw6WPTUsYayhtKu0fVBRvkWNOeysd4pyOtO8aHp9WznPeUUiG68aL6eXv0FhYDJDril5J0iGbNJMOPVQdi4uKCN-WaHKZT9kaHcCJ6sWSKaY7LQznrbNbgF0C_9RiHxkxwHCBzTEB0wVRTPNa7FMsEKZMEQT90SiTZ54K959UTh0Z48fu8rL6-v_1yc1fff_rw8ebtfW2EEKUWkg3WWhg0H50QVsjOid3ApWMjGGZsL7vBWd0aZ9y4axmVbWeklLwD7XrDL6tX59xDit9XyEXNPhsIQS8Q16xG_MOhG1uGytf_VCIB2nPa9hSl12epSTHnBE4dkp91OqFo0_Vqr_4kpTZSinKFpND87mwGfPbRQ1LZ-I2J9QlMUTb6_4t581eMQSobs29wgryPa0JgOLbKraLq87YS20YwhtvQSsF_AdCBvPE</recordid><startdate>20111101</startdate><enddate>20111101</enddate><creator>Garver-Apgar, Christine E</creator><creator>Eaton, Melissa A</creator><creator>Tybur, Joshua M</creator><creator>Emery Thompson, Melissa</creator><general>Elsevier Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7U4</scope><scope>BHHNA</scope><scope>DWI</scope><scope>WZK</scope><scope>8BJ</scope><scope>FQK</scope><scope>JBE</scope></search><sort><creationdate>20111101</creationdate><title>Evidence of intralocus sexual conflict: physically and hormonally masculine individuals have more attractive brothers relative to sisters</title><author>Garver-Apgar, Christine E ; Eaton, Melissa A ; Tybur, Joshua M ; Emery Thompson, Melissa</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c444t-4718ddde8a39f44d475f4b837f19ec1cd6758fda2cfcf9b210725c77735eaf6c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Conflict</topic><topic>Estrogen</topic><topic>Femininity</topic><topic>Genetics</topic><topic>Hormones</topic><topic>Human behaviour</topic><topic>Intralocus conflict</topic><topic>Masculinity</topic><topic>Psychiatry</topic><topic>Sex discrimination</topic><topic>Sexual behaviour</topic><topic>Sexual dimorphism</topic><topic>Sexually antagonistic selection</topic><topic>Siblings</topic><topic>Testosterone</topic><topic>Values</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Garver-Apgar, Christine E</creatorcontrib><creatorcontrib>Eaton, Melissa A</creatorcontrib><creatorcontrib>Tybur, Joshua M</creatorcontrib><creatorcontrib>Emery Thompson, Melissa</creatorcontrib><collection>CrossRef</collection><collection>Sociological Abstracts (pre-2017)</collection><collection>Sociological Abstracts</collection><collection>Sociological Abstracts</collection><collection>Sociological Abstracts (Ovid)</collection><collection>International Bibliography of the Social Sciences (IBSS)</collection><collection>International Bibliography of the Social Sciences</collection><collection>International Bibliography of the Social Sciences</collection><jtitle>Evolution and human behavior</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Garver-Apgar, Christine E</au><au>Eaton, Melissa A</au><au>Tybur, Joshua M</au><au>Emery Thompson, Melissa</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evidence of intralocus sexual conflict: physically and hormonally masculine individuals have more attractive brothers relative to sisters</atitle><jtitle>Evolution and human behavior</jtitle><date>2011-11-01</date><risdate>2011</risdate><volume>32</volume><issue>6</issue><spage>423</spage><epage>432</epage><pages>423-432</pages><issn>1090-5138</issn><eissn>1879-0607</eissn><coden>EHBEFF</coden><abstract>Abstract Intralocus sexual conflict (IASC) occurs when sex-specific selection favors genes that increase fitness in one sex and decrease fitness in the other sex. The current study was designed to explore whether IASC occurs in humans. In a sample of siblings, we identified and measured sexually dimorphic traits and hormones within each sex that are related to fitness and are likely coded for by antagonistic genes: waist-to-hip ratio (WHR) and breast size in women, WHR and bicep size (an index of muscularity) in men, and estradiol (E) and testosterone (T) in both sexes. If these traits and hormones are coded for by genes under IASC, masculine or feminine expression of traits and hormones should differentially predict brothers' and sisters' fitness. Consistent with an IASC model, both men and women who were physically masculine for their sex reported higher mate value brothers relative to sisters. Similarly, in normal-weight individuals, E levels positively predicted the mate value of sisters relative to brothers and T levels positively predicted the mate value of brothers relative to sisters. We found no evidence that individuals with indicators of high genetic quality (i.e., physically masculine men and physically feminine women) share high mate value with all siblings, regardless of sibling sex. Results are novel and demonstrate for the first time that intralocus conflict in humans may influence the fitness of related individuals.</abstract><pub>Elsevier Inc</pub><doi>10.1016/j.evolhumbehav.2011.03.005</doi><tpages>10</tpages></addata></record> |
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| source | Sociological Abstracts; Access via ScienceDirect (Elsevier) |
| subjects | Conflict Estrogen Femininity Genetics Hormones Human behaviour Intralocus conflict Masculinity Psychiatry Sex discrimination Sexual behaviour Sexual dimorphism Sexually antagonistic selection Siblings Testosterone Values |
| title | Evidence of intralocus sexual conflict: physically and hormonally masculine individuals have more attractive brothers relative to sisters |
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