¹Department of Genetics, University of Lund, Solvegatan 29, S-223 62 Lund, Sweden

Correspondence: Thomas Kraft, Novartis Seeds AB, Box 302, S-261 23 Landskrona, Sweden. E-mail: thomas.kraft@seeds.novartis.com

²Present address: Novartis Seeds AB, Box 302, S-261 23 Landskrona, Sweden.

Received 29 January 1998; Accepted 13 January 1999.

Abstract

When using molecular markers to study genetic variation, either the sampled individuals can be analysed individually or the individuals can be pooled and only the pools analysed (pooled samples). A theoretical investigation was carried out into the use of pooled samples in the detection of alleles and providing maximum likelihood estimates of allele frequency. The results show that, in many cases, pooled samples are more efficient than samples of individuals. Of the different pool sizes studied, small pools containing two or three individuals showed the smallest expected squared error of allele frequency estimates.