sexgroups nordomalesandfemalestendto

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Unformatted text preview: nd5inches tallerthanthefemale 10. MATING CHARACTERISTICS Thisdifferenceinskeletal morphologysuggestsatendency towardspolygynyinhumans Ifwewereactuallymonogamous, wewouldbethesameinbody shapeandsizebecausethere wouldbelittle/nocompetition Male& female mandrills Look form Sexual Dimorphisms You can use size, weight, sexual dichromatism, & other traits  Competition and Dimorphism Maleand female baboon canines Amongprimates,sexual dimorphisminbodysizeandin caninesizeisdirectlyrelatedto groupcomposition/matingstyle  Monogamy=littlecompetition= littleSD MM ­MFpromiscuousmating groups=stillmuchcompetition, butlesscompetitionandSDthan weseeinsingle  ­malegroups Harems/polygyny =substantial competition=thegreatestSD   Male&female blacklemurs Maleandfemaleorangutans Some Ways to Sex Primates Howtotellamalefromafemale!ThebasicInformation.  Lookforsexualdimorphisms(anydifferencesbetweenthemales andfemales).Forexample: Obviousgenitalia,andunusualgenitalia Bodysize(somespecieshavemoreobviousdifferences) Color,a.k.a.sexualdichromatism (inafewslides) Canines(ifthereisadifference,theywillbebiggerinmales) bling  Sexualswellingsinfemales,signsofestrus (nextslide) Oftenthefemalescarefortheyoung,andnotthemales butNOT Males always Ischialcallosities thiswillwork   forthe OWMandsomeapes Theyareunitedinmales,separateinfemales Professor L.M. Smolich Females Ischial callosities Thepartofthefemale   reproductivecyclewhen   theeggisreleasedfromtheovary (ovulating) Thefemaleishormonallyreceptivetosexualadvances fromthemales  Inmanyspecies,thisistheonlytimewhenafemaleis willingorphysicallyCANhavesex   e.g.lordosisinrats      Therearefewexceptions,e.g.bonobos  SDSU Fall 2011 14 Part III: Growth ad Development thru HMC LMS 16: Mammals and Primate Characteristics Biological Anthropology How To Attract A Mate Estrus Males show their ornamentation and strength Shegivesthreecuestoestrus (orovulation) 1.Visual  sexualswelling 2.Pheromonal  chemicalsignal 3.Behavioral  invitesthemaleforsex  shepresentsherreartothe...
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This note was uploaded on 09/14/2013 for the course ANTHRO 101 taught by Professor Riley during the Spring '12 term at San Diego State.

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