Table 1.

The evolutionary features of genomes in different lineages

Lineages	Genome⁎ duplication	Horizontal transfer	Gene duplication
Mammals	No	Very rare	Rare
Reptiles	Very rare	Rare	Rare
Amphibians	Frequent	Rare	Rare
Fish	Very frequent	Rare	Rare
Insects	Very rare	Rare	Moderate
Plants	Very frequent	Rare	Frequent
Fungi	Frequent	Frequent	Moderate
Bacteria	No	Very frequent	Rare

^⁎Note:Indicates genome duplication and/or polyploidy.