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Generative design is concerned with the definition and exploration of design spaces, and it has been suggested that emergence plays a key role in this process. In this paper, the impact of emergence on a design space is explored via consideration of different methods used to generate designs in a particular style. Three distinct methods of generating Islamic geometric patterns have been investigated and the extent to which emergence is employed in these methods has been explored. This research supports a discussion on the role of emergence in generative design, and an investigation into how design spaces are affected by the type of emergence employed in a generative process.

Denaturing gradient gel electrophoresis-random amplified polymorphic DNA (DGGE-RAPD) was used to overcome the main drawbacks of RAPD (i.e., the low levels of reproducibility and polymorphism). As a model, six barley cultivars of known origin were tested for RAPD markers using DGGE methodology with 29 arbitrary primers. Among a total of 418 bands observed, as high as 99 were polymorphic. Comparison between agarose-RAPD and DGGE-RAPD revealed that the latter was highly reproducible and gave higher level of polymorphism and consequently more markers. The relationships among barley cultivars derived from this study based on DGGE-RAPD are consistent with the known lineage of these cultivars. In conclusion, we recommend the use of DGGE-RAPD as an alternative tool to the more costly DNA-based analysis in cultivar identification in laboratories with limited funds.Key words: Denaturing gradient gel electrophoresis-random amplified polymorphic DNA, artificial heteroduplex, dendogram, lineage.