Search results for "sukusolut"
showing 3 items of 3 documents
Biologinen sukupuoli
2020
Biologinen sukupuoli on luonnostaan monitahoinen ilmiö. Epämääräinen kielenkäyttö tekee siitä kuitenkin tarpeettoman hämärän. Epämääräisyys voi sataa tiedevastaisten laariin ja syödä osaltaan tieteen arvostusta kansan keskuudessa. Sukupuoli on suvullisen lisääntymisen ja siten myös biologian perusyksikkö. Viime vuosina sukupuolen käsite on yhteiskunnallistunut keskusteluissa sukupuolivähemmistöjen oikeuksista. Keskustelu paljasti, että sukupuoli tarvitsee yleistajuista biologista jäsennystä. nonPeerReviewed
Coevolution of parental investment and sexually selected traits drives sex-role divergence
2016
Sex-role evolution theory attempts to explain the origin and direction of male–female differences. A fundamental question is why anisogamy, the difference in gamete size that defines the sexes, has repeatedly led to large differences in subsequent parental care. Here we construct models to confirm predictions that individuals benefit less from caring when they face stronger sexual selection and/or lower certainty of parentage. However, we overturn the widely cited claim that a negative feedback between the operational sex ratio and the opportunity cost of care selects for egalitarian sex roles. We further argue that our model does not predict any effect of the adult sex ratio (ASR) that is …
Kin selection in interactions between gametes: Gamete competition, gamete limitation, and sex allocation
2023
Kin selection on one hand, and gamete interactions in post-ejaculatory sexual selection on the other are two major research themes that have risen to prominence over the past half century and have simultaneously developed into central fields of research in evolutionary biology. There is a natural connection between the two: when gametes interact with each other, very commonly many of them originate from the same parent and are thus siblings. For example, sperm competition will almost always involve competition between sibling gametes even if the interacting parents are not related to each other. If parents are related to each other, the relatedness between gametes increases further. Here we…