Evolution, Vol. 71, No. 2 (FEBRUARY 2017), pp. 215-226 (12 pages) Many organisms spend a significant portion of their life cycle as haploids and as diploids (a haploid–diploid life cycle). However, ...
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 ...
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