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NECESSITY FOR NUCLEUS. "The invasion of Group II introns may have also led to nonsense-mediated decay as a way to remove intron-bearing transcripts from ribosomes but generation of a nuclear envelope combined with a system that links mRNA transport to the completion of splicing is a more definitive solution." https://lnkd.in/d8Qr_bk View in LinkedIn

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RISE OF POLYPLOIDY. "The evolution of meiosis resulted in homolog chromosome pairing, independent assortment, chiasmata-based crossing over, and ploidy changes (2N to 4N to 2N to 1N)." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn

PLAGUE REMOVAL. "The insertion of Group II introns into coding regions could have provided the selective pressure for the invention of the nucleus as a compartment where introns can be removed from pre-mRNAs before they are used by ribosome." https://lnkd.in/d8Qr_bk View in LinkedIn

LARGELY CHARACTERIZED. "All of the originally characterized members of these gene classes have now been mapped and sequenced, and all but one are representatives of the type II MADS-box family of transcription factors, the exception being the A-class gene APETALA2." https://lnkd.in/dVXk7jP View in LinkedIn

"THE ABCE GENETIC PROGRAM is a homeotic program, meaning that elimination or overexpression of gene function results in transformations in organ identity. For instance, loss of B gene function causes transformation of the petals into sepals and stamens into carpels, while overexpression of the B-class genes turns the sepals into petals and carpels into stamens." https://lnkd.in/dVXk7jP View in LinkedIn

E CLASS FLORAL GENES. "A fourth class of organ identity genes, the E class, was recently identified on the basis of their genetic sequence similarity rather than primary mutant phenotypes. The E-class loci act broadly across the floral meristem to facilitate the function of the other three classes." https://lnkd.in/dVXk7jP View in LinkedIn

MODULAR DISTRIBUTED GENES. "The generation of the predicted transformations by ectopic expression of the Brassica gene in transgenic tobacco indicates that gene functions are interchangable between phylogenetically distant species." https://lnkd.in/dGN8Y2C View in LinkedIn

FLORAL TRANSFORMATIONS. "We have generated transgenic tobacco plants that ectopically express the AGAMOUS gene from Brassica napus, which is necessary for the C function. Flowers on the resulting plants showed homeotic transformations of sepals into carpels and petals into stamens." https://lnkd.in/dGN8Y2C View in LinkedIn