IN an interesting article entitled "The present status of Plant Embryology" Dr. Donald A. Johansen 1 makes the following observation (p. 101) regarding the origin of polyembryony: "To cite another ...
Haploid plants, which carry only a single set of chromosomes, are typically sterile, making them valuable but difficult to use in breeding. A rare peach haploid mutant, '9-D', surprisingly exhibited ...
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