Abstract
1. 1. The relative genomic proportion of genes coding for ribosomal RNA has been determined in Ciona intestinalis ( Tunicata) and Branchiostoma lanceolatum ( Acrania). 2. 2. These experiments were performed in view of the hypothesis that there was a polyploidization event, when acraniate-like organisms emerged from tunicate-like animals during early chordate evolution. 3. 3. Ciona intestinalis, however, has a rDNA content six times that of Branchiostoma lanceolatum.
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