Results 261 to 270 of about 108,171 (302)
Some of the next articles are maybe not open access.
2014
The origin of species (speciation)—the process by which two or more species evolve from a single ancestral species—is a central problem in evolutionary biology. During the evolutionary synthesis of the twentieth century, the dominant theory of speciation for those working on sexually reproducing animals was allopatric speciation.
openaire +1 more source
The origin of species (speciation)—the process by which two or more species evolve from a single ancestral species—is a central problem in evolutionary biology. During the evolutionary synthesis of the twentieth century, the dominant theory of speciation for those working on sexually reproducing animals was allopatric speciation.
openaire +1 more source
Founder effect and genetic disease in Sottunga, Finland
American Journal of Physical Anthropology, 1988AbstractPedigree data are analyzed in order to determine the factors responsible for the high frequencies of certain genetic disorders in an isolated Swedish‐speaking population of Finland's Å land archipelago. The founders of Sottunga are identified, and the genetic contributions of each founder to descending birth cohorts are estimated. Founders born
E, O'Brien +4 more
openaire +2 more sources
Founder effect in an island population of bighorn sheep
Molecular Ecology, 2001AbstractThe Tiburon Island population of desert bighorn sheep has increased in size from 20 founders in 1975 to approximately 650 in 1999. This population is now the only population being used as the source stock for transplantations throughout northern Mexico. To evaluate the genetic variation in this population, we examined 10 microsatellite loci and
P W, Hedrick +2 more
openaire +2 more sources
Founder effect of the C9 R95X mutation in Orientals
Human Genetics, 2003A nonsense mutation at codon 95 (R95X) in the C9 gene is responsible for most Japanese C9 deficiency (C9D) cases, with a carrier frequency of 6.7%. Upon analysis of microsatellite markers and newly identified dinucleotide repeat number polymorphisms in the 3' flanking region of the C9 gene, a founder effect was demonstrated for the R95X mutation of the
Vahid, Khajoee +9 more
openaire +2 more sources
Founder effects in modern populations
Science, 2018Human Evolution The genomes of ancient humans can reveal patterns of early human migration (see the Perspective by Achilli et al. ). Iceland has a genetically distinct population, despite relatively recent settlement (∼1100 years ago). Ebenesersdottir et al.
openaire +1 more source
Founder effect: assessment of variation in genetic contributions among founders.
Human biology, 1994We present a Monte Carlo method for determining the distribution of founders' genetic contributions to descendant cohorts. The simulation of genes through known pedigrees generates the probability distributions of contributed genes in recent cohorts of descendants, their means, and their variances. Genealogical data from three populations are analyzed:
E, O'Brien +3 more
openaire +1 more source
The role of founder effects on the evolution of reproductive isolation
Journal of Evolutionary Biology, 2013AbstractSeveral theories argue that large changes in allele frequencies through genetic drift after a small founding population becomes allopatrically isolated can lead to significant changes in reproductive isolation and thus trigger the origin of new species. For this reason, founder speciation has been proposed as a potent force in the generation of
openaire +3 more sources
Population Bottlenecks and Founder Effects
2006Abstract Patterns of geographic variation arise from the combined effects of migration, selection, mutation, and genetic drift. One measure of the evolutionary potential for such geographic differentiation is the level of additive genetic variance (i.e., the linear resemblance between relatives, hereafter denoted VA; see Roff, Ch.
openaire +1 more source
The founder effect in a human isolate: Evolutionary implications
American Journal of Physical Anthropology, 1970AbstractAn investigation of the founder effect has been made on the H‐leut, a religious isolate. Ninety‐one founders, representing a maximum of 150 independent genomes, have been shown to account for the total gene pool of the 9,536 people in two of the three major subpopulations within the isolate, the S‐leut and the L‐leut.
openaire +2 more sources