Abstract
The first spontaneous reciprocal translocation detected in a wild population of Collinsia was found in C. parryi. The interchange complex occurred as a ring or chain of four chromosomes at metaphase I and displayed an alternate or adjacent configuration in approximately equal frequencies at this stage. Crosses involving plants with an interchange complex gave progeny with only bivalents or an interchange complex in approximately equal frequencies. These observations suggest that the breaks probably occurred within the intervening segment of nonhomologous chromosomes and close to one of the chiasma-forming segments in each chromosome arm.
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