Rome's Palazzo Farnese floor plan

Detail of a diagram of DNA strands of two yeast strains that have been crossbred, showing where meiotic crossover has occurred. Detail shows parts of 11 of yeast's 16 chromosomes.

During meiosis, the chromosomes from male and female parents or, in this case, from the two crossbred strains of yeast (Saccharomyces cerevisiae) undergo recombination, swapping segments of homologous chromosomes. This diagram charts the crossovers among yeast's 16 chromosomes.

Image by Elizabeth A. Winzeler, Stanford University. From the cover of Science, 21 August 1998.

Simultaneously rendering old and new physical relationships of segments with zigs and zags represents a phenomenon that occurs at the molecular level. This method encapsulates a complex process in a single image.
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