For example, the often homomorphic sex chromosomes in plants have been compared to the highly divergent systems in some animal model systems, such as birds, Drosophila and therian mammals, with many hypotheses offered to explain the apparent dissimilarities, including the younger age of plant sex ...
38]. Forprestin, there is extensive evidence of positive selection across the tree of life (tetrapods, mammals, therians, placentals, primates, echolocators), but also convergent evolution and parallel substitutions among echolocating mammals, such as...