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SEA URCHIN DNA SEQUENCE VARIATION AND REDUCED INTERSPECIES DIFFERENCES OF THE LESS VARIABLE DNA SEQUENCES

Individual sea urchins of the species Stronglyocentrotus purpuratus differ from each other in about 4% of the nucleotide pairs of their single copy DNA sequences (Britten et al., 1978). In the past we have referred to single copy DNA sequence polymorphism (Britten et al., 1978), but for purposes of clarity we use here the term sequence variation which is defined as the percent difference in sequence between individual genomes averaged for a population and averaged over all of the single copy DNA.