1
The first angiosperms must have evolved from one of the gymnosperm species that dominated the world at the time.
2
Conclusions: We propose the ancestral SLEEPER gene was formed after a process of retro-transposition during the evolution of the first angiosperms.
3
The Amborella genome suggests that the first angiosperms probably appeared when the ancestral gymnosperm underwent a 'whole genome doubling' event about 200 million years ago.