Mutual cam to cam sexchat - Ancient polyploidization predating divergence of the cereals
It has been identified mainly in amphibians and bony fishes.
Although some studies suggested one or more common genome duplications are shared by all vertebrates (including humans), the evidence is not as strong as in the other cases because the duplications, if they exist, happened so long ago, and the matter is still under debate.
The duplicated genes can undergo neofunctionalization or subfunctionalization which could help the organism adapt to the new environment or survive different stress conditions.
It has been found that almost all flowering plants have undergone at least one round of genome duplication at some point during their evolutionary history.
Ancient genome duplications are also found in the early ancestor of vertebrates (which includes the human lineage) and another near the origin of the bony fishes.
Overall, paleopolyploidy can have both short-term and long-term evolutionary effects on an organism's fitness in the natural environment.
Genome doubling provided the organism with redundant alleles that can evolve freely with little selection pressure.
Ancient genome duplications are widespread throughout eukaryotic lineages, particularly in plants.
Studies suggest that the common ancestor of Poaceae, the grass family which includes important crop species such as maize, rice, wheat, and sugar cane, shared a whole genome duplication about The core eudicots also shared a common whole genome triplication (paleo-hexaploidy), which was estimated to have occurred after monocot-eudicot divergence but before the divergence of rosids and asterids.
Paleopolyploidization events lead to massive cellular changes, including doubling of the genetic material, changes in gene expression and increased cell size.
Gene loss during diploidization is not completely random, but heavily selected. On the other hand, individual genes are not duplicated.
Most paleopolyploids, through evolutionary time, have lost their polyploid status through a process called diploidization, and are currently considered diploids e.g.Tags: Adult Dating, affair dating, sex dating