Extraordinary sex ratios
WebNov 21, 2005 · When male-male combat is very severe, the sex ratio can be extraordinary female-biased (less than 5%). The model assumptions and the results generally agree with experimental data on Melittobia wasps in which extraordinary female-biased sex ratio is observed. Our study might provide a new basis for the evolution of female-biased sex … WebJul 15, 2024 · Parker, Baker, and Smith provided the first robust theory explaining why anisogamy evolves in parallel in multicellular organisms. Anisogamy sets the stage for the emergence of separate sexes, and for another phenomenon with which Parker is associated: sperm competition. In outcrossing taxa with separate sexes, Fisher proposed …
Extraordinary sex ratios
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WebTitle: Extraordinary Sex Ratios Created Date: 20160809234552Z Webconstrained by the complex machinery that implements it, then a 1:1 sex ratio is inevitable, even if sub-optimal [51,52]. Once established under a regime favoring equal sex ratios, such genetic sex determination (GSD) systems could be a phylogenetic constraint. This appears likely in lizards [53], frogs [54], and some deep-sea invertebrates [55].
WebJul 13, 2007 · The ratio of males to females in a species is often considered to be relatively constant, at least over ecological time. Hamilton noted that the spread of "selfish" sex ratio-distorting elements could be rapid and produce a switch to highly biased population sex ratios. Selection against a highly sk … WebAug 27, 2012 · Sex-ratio evolution drives cultural evolution of a group-associated trait governing mortality in the homogametic sex. The two-sex dynamics under resource limitation induces a strong Allee effect ...
WebHere are the main points which are purportedly touched upon within Extraordinary Sex Ratios: 1. The levels-of-selection debate. 2;. The idea of conflict within the genome. 3. … Webdiscusses the implications of a "sex-ratio theory for sex linkage and inbreeding . . ." for cytogenetics and entomology. "the article is concerned with situations where certain underlying assumptions of fisher's argument do not hold." the following areas are considered: sex-linked drive under random mating and with local competition for mates, …
WebOur study supposes that an extraordinary sex ratio’s ecological consequence, population persistence or extinction, depends on interaction with a culturally inherited trait. Cultural …
WebSex ratio theory has provided one of the most productive and successful areas of evolutionary biology (Charnov 1982; Hardy 2002; West 2009 ). Theory predicts a number … drive from cincinnati to kansas cityWebOct 13, 2008 · The weevil subfamily Scolytinae includes at least seven groups of regularly sib-mating species with extremely female-biased offspring sex ratios. The enigmatic SE-Asian bark beetle genus Ozopemon (25spp.) belong to the most diversified clade (>1400spp.) of such ancient inbreeding lineages. epic insurance nycWebTHE FOLLOWING AREAS ARE CONSIDERED: SEX-LINKED DRIVE UNDER RANDOM MATING AND WITH LOCAL COMPETITION FOR MATES, NON-SEX-LINKED … epic intake and output activityWebSex-ratio evolution drives cultural evolution of a group-associated trait governing mortality in the homogametic sex. The two-sex dynamics under resource limitation … epic insurance everettWebExtraordinary Sex Ratios: A sex-ratio theory for sex linkage and inbreeding has new implications in cytogenetics and entomology. W. D. Hamilton Authors Info & Affiliations Science 28 Apr 1967 Vol 156, Issue 3774 pp. 477 - 488 DOI: … drive from cincinnati to memphisWebThis model investigates emergent patterns in a demographic property of a population: the adult sex ratio (ASR). ASR is defined as the ratio of males to females in the adult … drive from cincinnati oh to nashville tnWebExtraordinary sex ratios Between 1964 and 1977, Hamilton was a lecturer at Imperial College London . [5] Whilst there he published a paper in Science on "extraordinary sex ratios". epic insurance franklin in