منابع مشابه
Chromosomal rearrangements and speciation.
Several authors have proposed that speciation frequently occurs when a population becomes fixed for one or more chromosomal rearrangements that reduce fitness when they are heterozygous. This hypothesis has little theoretical support because mutations that cause a large reduction in fitness can be fixed through drift only in small, inbred populations. Moreover, the effects of chromosomal rearra...
متن کاملChromosomal Speciation in Primates
6. A. G. W. Cameron, P. Höflich, P. C. Myers, D. D. Clayton, Astrophys. J. 447, L53 (1995). 7. G. J. Wasserburg, M. Busso, R. Gallino, C. M. Raiteri, Astrophys. J. 424, 412 (1994). 8. F. H. Shu, H. Shang, T. Lee, Science 271, 1545 (1996). 9. M. Gounelle et al., Astrophys. J. 548, 1051 (2001). 10. G. R. Huss, G. J. MacPherson, G. J.Wasserburg, S. S. Russell, G. Srinivasan, Meteorit. Planet. Sci....
متن کاملRapid speciation and chromosomal evolution in mammals.
To test the hypothesis that population subdivision into small demes promotes both rapid speciation and evolutionary changes in gene arrangement by inbreeding and drift, we estimated rates of speciation and rates of chromosomal evolution in 225 genera of vertebrates. Rates of speciation were estimated by considering the number of living species in each genus and the fossil record of each genus a...
متن کاملCascading Chromosomal Speciation in Lizards: A Second Look!
The extent of Robertsonian chromosomal variation in the iguanid lizard Sceloporus grammicus of Mexico is exceptional among lower vertebrates, and this case has been the basis for the cascading chromosomal speciation hypothesis. This paper examines some of the population genetic assumptions of this model by comparing allozyme variability within and among 13 samples of S. grammicus with an equal ...
متن کاملChromosomal speciation and molecular divergence--accelerated evolution in rearranged chromosomes.
Humans and their closest evolutionary relatives, the chimpanzees, differ in approximately 1.24% of their genomic DNA sequences. The fraction of these changes accumulated during the speciation processes that have separated the two lineages may be of special relevance in understanding the basis of their differences. We analyzed human and chimpanzee sequence data to search for the patterns of dive...
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ژورنال
عنوان ژورنال: Evolution
سال: 1995
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1995.tb05974.x