{"created":"2025-03-03T03:00:10.764206+00:00","id":2000746,"links":{},"metadata":{"_buckets":{"deposit":"48c9c326-1f4b-4acf-8259-1faadfaa4935"},"_deposit":{"created_by":11,"id":"2000746","owner":"11","owners":[11],"pid":{"revision_id":0,"type":"depid","value":"2000746"},"status":"published"},"_oai":{"id":"oai:kagawa-u.repo.nii.ac.jp:02000746","sets":["2"]},"author_link":["109"],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"3","bibliographicPageEnd":"284","bibliographicPageStart":"273","bibliographicVolumeNumber":"40","bibliographic_titles":[{"bibliographic_title":"Journal of ethology","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"有性生殖の進化は生物学における最大の謎の一つである。有性生殖は「減数分裂によるゲノム希釈」と「雄は卵を産まない」という「性の２倍のコスト」を負っている。最初の同型配偶生物のゲノム希釈克服と、卵と精子の二極化への進化について新仮説を提唱した。","subitem_description_language":"ja","subitem_description_type":"Abstract"},{"subitem_description":"The evolution of gametic sex (meiosis and fertilization) and subsequent transition from isogamy (fusion between two equal-sized gametes) to anisogamy (dimorphism into eggs and sperm, namely, females and males) is one of the largest enigmas of evolutionary biology. Meiosis entails genome-dilution cost and anisogamy entails male-production cost. Despite much progress has been made for the maintenance mechanisms of sex, its origination events under such “twofold cost of sex” are still unsolved. Here, we posit two hypothetical scenarios as follows: the “Seesaw Effect” hypothesizes that automictic selfing between isogametes effectively purged deleterious mutations from an organism’s lineage and simultaneously fixed the sex-controlling allele and all other loci (no genome-dilution cost raised). The high relatedness among homoeologous cell colonies led to multicellularization. The “inflated isogamy” hypothesizes that multicellularity increased the reproductive investment of both mates, resulting in excessively large isogametes. This redundancy induced cheating of one sex (evolving to male) to reduce gamete size. However, the other sex (evolving to female) allowed this cheat because her cost did not change. Therefore, anisogamy originated as a kind of commensalism but turned into beneficial for females because it solved the gamete limitation problem inherent to isogamy. Thus, smooth transition to anisogamy had been attained.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_10001_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Springer Nature","subitem_publisher_language":"en"}]},"item_10001_relation_12":{"attribute_name":"論文ID（NAID）","attribute_value_mlt":[{"subitem_relation_type":"isIdenticalTo","subitem_relation_type_id":{"subitem_relation_type_id_text":"https://cir.nii.ac.jp/crid/1360580232148409344","subitem_relation_type_select":"CRID"}}]},"item_10001_rights_15":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"This article is published under an open access license.","subitem_rights_language":"en"}]},"item_10001_source_id_11":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA11626971","subitem_source_identifier_type":"NCID"}]},"item_10001_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1439-5444","subitem_source_identifier_type":"EISSN"}]},"item_10001_version_type_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_1691368617353":{"attribute_name":"識別子","attribute_value_mlt":[{"subitem_identifier_type":"DOI","subitem_identifier_uri":"https://doi.org/10.1007/s10164-022-00760-3"}]},"item_1691372060236":{"attribute_name":"助成情報","attribute_value_mlt":[{"subitem_award_numbers":{"subitem_award_number":"26440241","subitem_award_number_type":"JGN","subitem_award_uri":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26440241/"},"subitem_award_titles":[{"subitem_award_title":"雌の多回交尾の進化に関する遺伝的bet-hedging仮説の再検討","subitem_award_title_language":"ja"},{"subitem_award_title":"Genetic bet-hedging as a mechanism for the evolution of polyandry, reexamined","subitem_award_title_language":"en"}],"subitem_funder_identifiers":{"subitem_funder_identifier":"https://doi.org/10.13039/501100001691","subitem_funder_identifier_type":"Crossref Funder"},"subitem_funder_names":[{"subitem_funder_name":"日本学術振興会","subitem_funder_name_language":"ja"},{"subitem_funder_name":"Japan Society for the Promotion of Science","subitem_funder_name_language":"en"}],"subitem_funding_stream_identifiers":{"subitem_funding_stream_identifier":"JS","subitem_funding_stream_identifier_type":"JGN_fundingStream"},"subitem_funding_streams":[{"subitem_funding_stream":"基盤研究(C)","subitem_funding_stream_language":"ja"},{"subitem_funding_stream":"Grant-in-Aid for Scientific Research 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行雄","creatorNameLang":"ja"},{"creatorName":"ヤスイ, ユキオ","creatorNameLang":"ja-Kana"}],"familyNames":[{"familyName":"Yasui","familyNameLang":"en"},{"familyName":"安井","familyNameLang":"ja"},{"familyName":"ヤスイ","familyNameLang":"ja-Kana"}],"givenNames":[{"givenName":"Yukio","givenNameLang":"en"},{"givenName":"行雄","givenNameLang":"ja"},{"givenName":"ユキオ","givenNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"109","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"1000030325328","nameIdentifierScheme":"CiNii 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of sex","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Anisogamy","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Deleterious mutation","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Kondrashov effect","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Automixis","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"The origination events of gametic sexual reproduction and anisogamy","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"The origination events of gametic sexual reproduction and anisogamy","subitem_title_language":"en"}]},"item_type_id":"10001","owner":"11","path":["2"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2025-03-03"},"publish_date":"2025-03-03","publish_status":"0","recid":"2000746","relation_version_is_last":true,"title":["The origination events of gametic sexual reproduction and anisogamy"],"weko_creator_id":"11","weko_shared_id":-1},"updated":"2025-03-21T05:07:24.606939+00:00"}