These strains are also inbred to homozygosity, albeit through fewer generations, and therefore under-represent the true genomic variation in wild-caught mice.
The RNA viruses in plants may have passed through fewer generations, and they are often inherited vertically with little genetic variation [ 88].
Long ROH regions have gone through selection for few generations, and will eventually break down into medium and then short ROH.
To remind us that this isn't just drama based on a real event, it's based on real people, too, and their accounts of what they lived through, people only a few generations ahead of us.
Gene frequencies drift: Although rare on the mainland, these small differences become common in the island population over the course of a few generations through the action of genetic drift.
Second, rarely have any QTN been shown empirically to change in frequency through more than a few generations in natural populations, on time scales pertinent to the evolution of traits through ecological selection (but see Barrett and Schluter 2008), thus pairing the QTN approach with the direct observation of the evolutionary process advocated by Travisano and Shaw.
Europeans have gone through similar pain, just a few generations ago.
For models such as Arabidopsis thaliana with simple screening options such as marker selection [ 2], short generation times (<1 month), and single-to-low copy number transformation methods (through Agrobacterium tumefaciens), selection of homozygous plants can be achieved within respectable timelines through Mendelian segregation studies over few generations [ 3].
Every few generations the global economy goes through a process of meltdown and reconstruction.
Also on Friday, Engelbert Humperdinck, who has been a heart-throb to a few generations, opens a three-day run through next Sunday at the Music Fair.
