Abstract
1. The process of developmental selection is a normal event or succession of events in the life cycle of vascular plants, where it assumes various forms, being represented chiefly by embryonic selection, gametophytic selection, and gametic selection. 2. Developmental selection differs materially from natural selection, germinal selection, the intraselection of Roux, as well as the other selection theories. 3. Records of conspicuous cases of polyembryony in ferns are brought together. Original studies are added, constituting definite evidence that a selective plurality of embryos may normally exist even in the leptosporangiate ferns. Nearly all living ferns seem to have embryonic selection, or show evidence of having passed through a stage in which embryonic selection was the normal condition. The embryonic selection represented by the polyembryony of gymnosperms was derived from an embryonic selection habit in their fern ancestors. 4. Developmental selection in gymnosperms and angiosperms is not only repr...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
