One of the problems with working with duplications is getting them homozygous. Duplications such as tDp3La and dDp3L-3S (MNL 46:138-142) and those produced by crossing translocations or inversions with overlapping break points are difficult to transmit through the pollen because of competition with normal pollen. A solution to this problem is to cross the duplication/normal heterozygotes with the appropriate TB-A translocation and then to self-fertilize the hypoploid progeny. The chromosome with the duplication is freed from competition with normal chromosomes and homozygous progeny results. This was attempted last summer. Because of poor growing conditions few hypoploids survived. It will be repeated.
G. G. Doyle
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