scholarly journals The Stochastic Encounter-Mating Model

2016 ◽  
Vol 148 (1) ◽  
pp. 71-102 ◽  
Author(s):  
Onur Gün ◽  
Atilla Yilmaz
Keyword(s):  
Mating Model

scholarly journals THE EFFECTIVE PROPORTION OF SELF-FERTILIZATION WITH CONSANGUINEOUS MATINGS IN INBRED POPULATIONS

Genetics ◽  
1984 ◽  
Vol 106 (1) ◽  
pp. 139-152
Author(s):  
Kermit Ritland
Keyword(s):  
Mixed Mating ◽  
Selfing Rate ◽  
Genotypic Distribution ◽  
Self Fertilization ◽  
Allelic Segregation ◽  
Mixed Mating Model ◽  
Mating Model ◽  
Inbred Populations ◽  
Biased Estimates ◽  
Independent Parameters

ABSTRACT Allelic segregation at a single locus among offspring derived from matings, including those between inbred relatives, is a combination of two patterns, corresponding to self-fertilization and random outcrossing. The proportion of effective self-fertilization is termed the "effective selfing rate," and it is specified with identity coefficients. The description of the offspring genotypic distribution for a population with mating among relatives requires a set of three independent parameters of genetic and mating structure. One such set is the inbreeding coefficient of parents, the coefficient of kinship between mates and the effective selfing rate. The model used to derive the effective selfing rate distinguishes between the effective selfing rates of inbred vs. outbred parents; the mixed mating model does not distinguish between these two rates. As a result, the mixed mating model usually gives biased estimates of effective selfing, if there is mating among inbred relatives. The procedure for estimation of effective selfing, based upon progeny array data distributed according to the "effective selfing model," is presented, and an example is given.

scholarly journals Microsatellite analysis of the mating system of Bruguiera gymnorrhiza and Kandelia obovata

2018 ◽  
Vol 197 ◽  
pp. 06003
Author(s):  
Mohammad Basyuni ◽  
Shigeyuki Baba ◽  
Hirosuke Oku ◽  
Ridha Wati ◽  
Annisa Fitri
Keyword(s):  
Mating System ◽  
System Analysis ◽  
Genetic Relatedness ◽  
Mixed Mating ◽  
Bruguiera Gymnorrhiza ◽  
Mangrove Tree ◽  
Mixed Mating Model ◽  
Mating Model ◽  
Inbreeding Level ◽  
Cross Fertilization

Microsatellite loci were used for estimating mating system for three populations of B. gymnorrhiza and K. obovata (Rhizophoracea) in Okinawa, Japan. Mother trees and thirty offspring of individual samples representing the population of both species were genotyped at five microsatellites. The mating system was examined using two approaches: a mixed mating model of multilocus testing, implemented by MLTR program and outcrossing rate from the level of inbreeding. Mating system analysis showed multilocus outcrossing rates (tm) for both species was 0.850-1.000 and 0.780-0.938 respectively. By contrast, according to inbreeding level, tm was lower than MLRT: 0.495-1.028 and 0.480-0.612 of both species respectively. However, biparental inbreeding (tm- ts) was diverse from zero both species for all three populations, showing that cross-fertilization events may ensue between the relatives both species. This data as well means the genetic relatedness (r) for B. gymnorrhiza and K. obovata were 0.108±0.025 and 0.032±0.09 respectively. Average relatedness was below 0.25, the value for a half-sib relationship. These results suggest that postulation of a half-sib relationship among progeny of open-pollinated families is opposed for both mangrove tree species.

scholarly journals Assortative mating without assortative preference

2015 ◽  
Vol 112 (19) ◽  
pp. 5974-5978 ◽  
Author(s):  
Yu Xie ◽  
Siwei Cheng ◽  
Xiang Zhou
Keyword(s):  
Assortative Mating ◽  
Closed System ◽  
Dynamic Process ◽  
Finite Population ◽  
Social Characteristics ◽  
Dynamic Processes ◽  
Mating Model

Assortative mating—marriage of a man and a woman with similar social characteristics—is a commonly observed phenomenon. In the existing literature in both sociology and economics, this phenomenon has mainly been attributed to individuals’ conscious preferences for assortative mating. In this paper, we show that patterns of assortative mating may arise from another structural source even if individuals do not have assortative preferences or possess complementary attributes: dynamic processes of marriages in a closed system. For a given cohort of youth in a finite population, as the percentage of married persons increases, unmarried persons who newly enter marriage are systematically different from those who married earlier, giving rise to the phenomenon of assortative mating. We use microsimulation methods to illustrate this dynamic process, using first the conventional deterministic Gale–Shapley model, then a probabilistic Gale–Shapley model, and then two versions of the encounter mating model.

Genetic structure and mating system of white spruce (Piceaglauca) in a seed production area

1984 ◽  
Vol 14 (5) ◽  
pp. 639-643 ◽  
Author(s):  
John N. King ◽  
Bruce P. Dancik ◽  
Narinder K. Dhir
Keyword(s):  
Genetic Structure ◽  
Mating System ◽  
Seed Production ◽  
Gel Electrophoresis ◽  
Random Mating ◽  
White Spruce ◽  
Starch Gel Electrophoresis ◽  
Starch Gel ◽  
Production Area ◽  
Mating Model

Embryos and megagametophytes of open-pollinated seed of 37 white spruce (Piceaglauca (Moench) Voss) trees from a seed production area were analyzed by starch gel electrophoresis to determine the genetic structure and mating system over 2 seed crop years. Analysis of four polymorphic enzyme loci (Gdh, Idh, Pgm, and Pgi-2) for spatial and temporal genetic structure and mating system indicated substantial deviations from the random mating model that is assumed when open-pollinated families are designated as half-sibs.

scholarly journals Aphrodisiac property of aerial parts of Trianthema decandra Linn.

2017 ◽  
Vol 6 (3) ◽  
pp. 178-182
Author(s):  
Veeresh ◽  
◽  
Pramod Kumar ◽  
V Rama Mohan Gupta ◽  
◽  
...  
Keyword(s):  
Male Mouse ◽  
Biologically Active ◽  
Vaginal Smear ◽  
High Dose ◽  
Mice Model ◽  
Active Constituents ◽  
Aerial Parts ◽  
Mating Model ◽  
Separate Cage ◽  
Pregnancy And Birth

Aim of the study is to identify and evaluate the active constituents present in the aerial parts of Trianthema decandra Linn. The fresh aerial parts of plant were collected, dried under shade, coarsely powdered and successively extracted with different solvents based on increasing order of polarity. All the extracts of the plant were subjected for phytochemical screening. The methanol extract was screened for aphrodisiac activity. The sexual activity of male mice in Assessment of mating model was determined by administering methanolic extract of Trianthema decandra of different doses and each male mouse was placed in separate cage. After one hour, five oestrous females were placed into each cage and cohabitated overnight. The vaginal smear of each female mouse was examined next day under the microscope to confirm mating by the presence of sperms. To study the Effect on fertility in mice model, different groups of animals (mice) were treated as above and each male mouse was placed in separate cage. After one hour, one oestrous female with proven fertility was admitted into each cage and cohabitated overnight. These females were watched for pregnancy and birth of offspring’s. In the conclusion, out of all test extract doses of Trianthema decandra, medium and high dose showed significant aphrodisiac activity when compared with control and standard groups. Hence this reveals that Trianthema decandra have fertility enhancing activity. Further research is needed to identify biologically active constituents for fertility enhancing activity.

scholarly journals A TWO-SEX POLYGENIC MODEL FOR THE EVOLUTION OF PREMATING ISOLATION. II. COMPUTER SIMULATION OF EXPERIMENTAL SELECTION PROCEDURES

Genetics ◽  
1981 ◽  
Vol 97 (1) ◽  
pp. 217-235
Author(s):  
J A Sved
Keyword(s):  
Computer Simulation ◽  
Laboratory Experiments ◽  
Small Population ◽  
Premating Isolation ◽  
Selection Procedures ◽  
Population Sizes ◽  
Selective Forces ◽  
Mating Model ◽  
Mating Choice ◽  
Monte Carlo Simulation Program

ABSTRACT A Monte-Carlo simulation program is described for a polygenic mating model introduced in the first paper in this series (Sved 1981). The program is used to simulate the situation in laboratory experiments in which two strains are allowed to mass-mate, hybrids are artificially eliminated and the establishment of mating isolation is studied. It is shown that, if mating choice is sufficiently precise, a combination of chance fluctuation and selection can lead to divergence in mating behavior. However, for small population sizes, the variability would usually be considerably reduced by the time some divergence is established, leading to low eventual levels of isolation. For larger population sizes, on the other hand, it may take many generations for any divergence to be established. —A dissection of the selective forces involved in the divergence shows that the major force potentially responsible for initial selective response is the tendency for divergent females and males to reject mates from the wrong strain. However, this is nullified in mixed-strain matings by the tendency of such individuals equally to reject mates from the correct strain. To overcome this problem, it is suggested that the usual mixed-strain mating procedure be replaced by procedures specifically designed to select for rejection of interstrain matings. Two procedures are suggested for this, and computer simulation shows that one or other of the procedures will work under the assumptions of the mating model. Other possible outcomes of selection, including asymmetrical divergence, are discussed for cases in which the assumptions of the mating model are invalid.

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