Biomedical subjects

J C Whittaker

Publications and source records attributed to J C Whittaker.

3 recordsLinked to original sources

PubMed1995

Using marker-maps in marker-assisted selection.

A method of using information on the location of markers to improve the efficiency of marker-assisted selection (MAS) in a population produced by a cross between two inbred lines is developed. The method is closer to mapping QTL than the selection index approaches to MAS described by previous authors. We use computer simulations to compare our method with phenotypic selection and two selection index approaches, simulations being performed on three genetic maps. The simulations show that whilst MAS can be considerably more efficient than phenotypic selection differences between the three MAS methods are slight. Which of the MAS methods is best depends on a number of factors: in particular the genetic map, the time scale under consideration ant the population size are of importance.

Chromosome Mapping↗

PubMed1994

Multiple trial two strategy conflicts.

Much work has been done on iterated conflicts where the one-trial conflict is the Prisoner's Dilemma. The present paper is concerned with an iterated contest where the underlying contest has two pure strategies and the underlying payoff matrix is general; this therefore includes the Prisoner's Dilemma as a special case. By limiting the player's memory severely we can almost completely specify the Evolutionary Stable Strategies (ESS) of the two- and infinite-trial conflicts derived from this underlying payoff matrix.

Animals↗

PubMed1991

A two-trial two-strategy conflict.

Iterated conflicts allow the possibility of co-operative-like behaviour in games such as the Prisoner's Dilemma. The present paper is an attempt to initiate the study of iterated conflicts when, (a) the number of iterations is fixed and finite and (b) the underlying payoff matrix is general, e.g. a mixed Evolutionary Stable Strategy (ESS) could occur in the non-iterated coflict. These assumptions are in contrast to the Iterated Prisoner's Dilemma. We consider a somewhat special case which none the less produces results of an interesting nature. For those cases where there is no internal ESS in the one trial case the two-trial case is easily resolved. When the former has an internal ESS then the two-trial case yields two ESSs whose supports are a partition of the space of strategies.

Animals↗