This rate of link attachment and detachment is much larger than the duplication rate of g ~ 10-3 proteintein and million years.
We also identified a much larger number of duplications events using SSRs than gene coding sequences, and revealed a limited overlap between gene-based and SSR-based duplication events.
DNA molecules for drift duplications are usually much larger than those for RNA-mediated duplications and may not be able to move to different chromosomes easily.
It is apparent from our dot plot analyses that the 14- 31- 15 and 16- 32- 17 duplication was preceded by a duplication of a much larger gene block containing the progenitors of what are now < Abpbg- Abpa > modules 7, 8, 9, 10, 11 and 12, as well as the single Abpbg pseudogenes 29 and 31.
A previous study showed that interchromosomal duplications are shorter (median length 2.5 kb) while intrachromosomal duplications are much larger (median length 20 kb) in the bovine genome [ 24].
Interchromosomal duplications are shorter (median length 2.5 kb) and more divergent (< 94% identity), while intrachromosomal duplications are much larger (median length 20 kb) showing higher sequence identity (~97%).
In addition to these conventional genetic markers, there is another kind of polymorphism, copy number variant (CNV), which operates on a much larger scale, involving deletions, insertions, duplications, and rearrangements of sections of DNA of length from 1000 base pairs up to several million base pairs (Beckmann et al. 2007; Redon et al. 2006).
It is interesting to note that P1 is the second largest RPG, implying that a much larger group of functions generated from gene duplication may have been involved in human formation than in other species.
Duplicate genes arise by several different mechanisms: unequal crossing over and retroposition, which give rise to small duplications, and chromosomal duplication and whole genome polyploidization, which involve much larger amounts of DNA [ 11].
The fact that the MEKK subfamily is much larger in solanaceaous species is probably due to specific duplications of those genes and further evolution that led to novel roles in those species.
