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Fig. 4 | Genome Biology

Fig. 4

From: Chromosome evolution at the origin of the ancestral vertebrate genome

Fig. 4

Evolutionary scenario models. (a) A single evolutionary scenario explains the formation of a single disjoint tetrad of ohnologous CARs. (b) Two equally possible evolutionary scenarios can explain how ohnologous CARs can form two adjacent tetrads: a fission or a fusion of chromosomes could have occurred between the 2 WGDs. In each case, the B and D chromosomes each possess two distinct parts (dark and light grey) homologous to distinct chromosome sets. B and D are therefore common to two tetrads. (c) A chromosome fusion after the two WGDs explains how two tetrads can be joined via a single CAR

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