Evolution of the most recent common ancestor of a population with no selection
نویسندگان
چکیده
We consider the evolution of a population of fixed size with no selection. The number of generations G to reach the first common ancestor evolves in time. This evolution can be described by a simple Markov process which allows one to calculate several characteristics of the time dependence of G. We also study how G is correlated to the genetic diversity.
منابع مشابه
Population growth of human Y chromosomes: a study of Y chromosome microsatellites.
We use variation at a set of eight human Y chromosome microsatellite loci to investigate the demographic history of the Y chromosome. Instead of assuming a population of constant size, as in most of the previous work on the Y chromosome, we consider a model which permits a period of recent population growth. We show that for most of the populations in our sample this model fits the data far bet...
متن کاملPhylogenetic Analysis of Three Long Non-coding RNA Genes: AK082072, AK043754 and AK082467
Now, it is clear that protein is just one of the most functional products produced by the eukaryotic genome. Indeed, a major part of the human genome is transcribed to non-coding sequences than to the coding sequence of the protein. In this study, we selected three long non-coding RNAs namely AK082072, AK043754 and AK082467 which show brain expression and local region conservation among vertebr...
متن کاملEvolutionary Theory and the Reality of Macro Probabilities
Evolutionary theory is awash with probabilities. For example, natural selection is said to occur when there is variation in fitness, and fitness is standardly decomposed into two components, viability and fertility, each of which is understood probabilistically. With respect to viability, a fertilized egg is said to have a certain chance of surviving to reproductive age; with respect to fertili...
متن کاملModeling the genealogy of a cultural trait.
The mathematical study of genealogies has yielded important insights in population biology, such as the ability to estimate the time to the most recent common ancestor (MRCA) of a sample of genetic sequences or of a group of individuals. Here we introduce a model of cultural genealogies that is a step toward answering similar questions for cultural traits. In our model individuals can inherit f...
متن کاملProbability, Population Genetics and Evolution
Branching process in random environment (BPRE) are a generalization of GaltonWatson processes where the reproduction law is picked randomly in an i.i.d manner in each generation. In the supercritical case, the population Zn either explodes (with a positive probability) or becomes extincted. We are interested in the event when the process Zn takes positive but bounded values for large times n. W...
متن کامل