The present invention relates to genetic mapping of complex quantitative and
qualitative traits. This invention more particularly relates to methods to identify
identical DNA fragments from two different DNA sources. The method allows the amplification
of the DNAs, their, labelling, and the separation of perfectly matched DNAs from
imperfectly matched DNAs or from DNAs formed through hybridisation from the same
source (e.g., homohybrids). The invention can be used to identify genes or gene
mutations, which are relevant to pathological conditions or particular traits.