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Population dynamics of a selfish B chromosome neutralized by the standard genome in the grasshopper Eyprepocnemis plorans.
Am Nat. 1997 Jun; 149(6):1030-50.AN

Abstract

Effects of the B chromosome polymorphism of the grasshopper Eyprepocnemis plorans were analyzed in two natural populations. Postmating sexual selection, female fertility, and survival were studied. The B chromosome lacks drive and has no detectable effects on fitness. A neutral B cannot invade a population and establish a polymorphism, but the confidence limits on our estimates cannot exclude the possibility that the polymorphism is maintained by a balance between weak drive and weak selection against individuals with two and three B's. However, other lines of evidence favor the following model of the dynamics of the B in E. plorans. In a newly invaded population, the B has substantial drive, but the evolution of drive suppressor genes in the A chromosomes neutralizes the B drive so that it becomes near-neutral and begins a random walk toward extinction by stochastic loss. Because the B is common by the time drive disappears, the random walk is likely to continue for a long time. If in the course of the random walk a variant B with greater drive appears, then it will displace the original variant, and a new cycle of drive suppression and drift to extinction occurs. A simulation model of this process suggested that the mean time to extinction is proportional to the two-thirds power of the population size; it is much less affected by subpopulation size or the number of populations in a subdivided population.

Authors+Show Affiliations

Departamento de Genetica, Facultad de Ciencias, Universidad de Granada, E-18071 Granada, Spain.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18811262

Citation

Camacho, J P., et al. "Population Dynamics of a Selfish B Chromosome Neutralized By the Standard Genome in the Grasshopper Eyprepocnemis Plorans." The American Naturalist, vol. 149, no. 6, 1997, pp. 1030-50.
Camacho JP, Shaw MW, López-León MD, et al. Population dynamics of a selfish B chromosome neutralized by the standard genome in the grasshopper Eyprepocnemis plorans. Am Nat. 1997;149(6):1030-50.
Camacho, J. P., Shaw, M. W., López-León, M. D., Pardo, M. C., & Cabrero, J. (1997). Population dynamics of a selfish B chromosome neutralized by the standard genome in the grasshopper Eyprepocnemis plorans. The American Naturalist, 149(6), 1030-50.
Camacho JP, et al. Population Dynamics of a Selfish B Chromosome Neutralized By the Standard Genome in the Grasshopper Eyprepocnemis Plorans. Am Nat. 1997;149(6):1030-50. PubMed PMID: 18811262.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Population dynamics of a selfish B chromosome neutralized by the standard genome in the grasshopper Eyprepocnemis plorans. AU - Camacho,J P, AU - Shaw,M W, AU - López-León,M D, AU - Pardo,M C, AU - Cabrero,J, PY - 1997/6/1/pubmed PY - 1997/6/1/medline PY - 1997/6/1/entrez SP - 1030 EP - 50 JF - The American naturalist JO - Am. Nat. VL - 149 IS - 6 N2 - Effects of the B chromosome polymorphism of the grasshopper Eyprepocnemis plorans were analyzed in two natural populations. Postmating sexual selection, female fertility, and survival were studied. The B chromosome lacks drive and has no detectable effects on fitness. A neutral B cannot invade a population and establish a polymorphism, but the confidence limits on our estimates cannot exclude the possibility that the polymorphism is maintained by a balance between weak drive and weak selection against individuals with two and three B's. However, other lines of evidence favor the following model of the dynamics of the B in E. plorans. In a newly invaded population, the B has substantial drive, but the evolution of drive suppressor genes in the A chromosomes neutralizes the B drive so that it becomes near-neutral and begins a random walk toward extinction by stochastic loss. Because the B is common by the time drive disappears, the random walk is likely to continue for a long time. If in the course of the random walk a variant B with greater drive appears, then it will displace the original variant, and a new cycle of drive suppression and drift to extinction occurs. A simulation model of this process suggested that the mean time to extinction is proportional to the two-thirds power of the population size; it is much less affected by subpopulation size or the number of populations in a subdivided population. SN - 0003-0147 UR - https://www.unboundmedicine.com/medline/citation/18811262/Population_dynamics_of_a_selfish_B_chromosome_neutralized_by_the_standard_genome_in_the_grasshopper_Eyprepocnemis_plorans_ DB - PRIME DP - Unbound Medicine ER -
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