Abstract Recent polyploidy in gymnosperms is unusually scarce being present only 9.80 % of the 714 taxa studied cytologically. Polyploid forms are represented by sporadic seedlings and individual trees, intraspecific cultivation or wild entirely polyploid species genera. Polyploidy shows a non-random distribution different genera mostly prevalent Ephedra Juniperus , besides classic examples Seq...

The abundance of p27(Kip1), an inhibitor of cell proliferation, is determined by Skp2-dependent proteolysis, the deregulation of which is associated with cancer progression. Lack of Skp2 results in p27(Kip1) accumulation as well as enlargement and polyploidy of hepatocytes. The role of Skp2 in cell growth and proliferation was investigated in Skp2-deficient mice subjected to partial hepatectomy...

Polyploidy has played a major role in the evolution of many eukaryotes. Recent studies have dramatically reshaped views of polyploid evolution, demonstrating that most polyploid species examined, both plant and animal, have formed recurrently from different populations of their progenitors. Populations of independent origin can subsequently come into contact and hybridize, generating new genoty...