Premium
ON THE EVOLUTION OF PARTHENOGENESIS. II. INBREEDING AND THE COST OF MEIOSIS
Author(s) -
Uyenoyama Marcy K.
Publication year - 1985
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1985.tb05686.x
Subject(s) - biology , inbreeding , parthenogenesis , meiosis , haplodiploidy , reproduction , offspring , evolutionary biology , genetics , inbreeding avoidance , population fragmentation , zoology , genetic variation , population , demography , gene , pregnancy , embryo , sociology , gene flow
Quantitative models of genetic change were analyzed to study the effect of inbreeding on the conditions for the evolution of parthenogenesis. Although inbreeding has been proposed as a key factor that may resolve the apparent paradox between the success of biparental reproduction and the genetic advantages of uniparental reproduction, the results indicate that inbreeding does not greatly change the cost of meiosis in diploids and actually increases it in haplodiploids. Inbreeding increases parent‐offspring relatedness and the reproductive value of females. These direct effects act antagonistically on the cost of meiosis: higher relatedness between parents and biparentally‐derived offspring promotes biparental reproduction, and high reproductive value of females promotes thelytoky. In diploids the two effects cancel one another, while in haplodiploids the latter predominates. A survey by Hamilton (1967) showed that a high proportion of haplodiploid species that undergo close inbreeding have thelytokous relatives, an association that is consistent with the result obtained here that, apart from its effect on the sex ratio, inbreeding directly promotes parthenogenesis in haplodiploids.