Abstract
Several disomic addition lines in which chromosomes of G. anomalum Wav. et Peyr. or G. stocksii Mast, are added to the genome of G. hirsutum L. have been arranged in parallel pairs based on very similar phenotypic modifications. Analyses of chromosome pairing in F1 hybrids of morphologically related addition lines have shown that: (1) although certain analogies are clear, it is nevertheless difficult to come to any conclusions as to the structural relations that may exist between chromosomes considered to be homeologous, (2) the degree of pairing does not seem to be a good test for chromosome affinities in species hybrids, and (3) chromosome pairing seems to depend on a complex system of controls which act both globally on the whole genome and specifically on those chromosomes normally destined to pair.
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