Vavilov's (1922) law of homologous series in variation foreshadowed the DNA-level demonstration of synteny across the genomes of different plant species. More recently, microsynteny studies revealed co-linearity at the level of genes between different species belonging to the same family. An early comparative genetic map developed among members of Solanaceae family highlighted the conserved order of DNA markers among genomes with two- to fourfold size variation (Grube et al. 2000). Similarly, positional conservation of gene order among the members of family Poaceae using cDNA anchor probes has been reported by numerous investigators.
Briefly, comparative genetic mapping has shown extensive co-linearity in different genomes belonging to the same family. Thus, the exploitation of genome co-linearity can help in determining correspondence among chromosomes of species belonging to the same tribe or family, which will be instrumental not only in categorizing chromosomes on the basis of sharing common genetic information but also in inferring the set of chromosomes of an ancestral angiosperm genotype.
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