The invention includes a method and array for replicating and analyzing one or a plurality of different target sequences in nucleic acid samples. The different reactions for replicating the target sequences occur simultaneously on an array with selectively heatable array elements with their reaction surfaces, some of which have been modified differently, and in the sample solution disposed thereabove. The target sequences are analyzed using molecular detection on reaction surfaces of said array that have been modified with probe strands. The target strands are replicated and analyzed simultaneously, successively, or alternately.