Conifer ancestors had a double dose of DNA
![Douglas fir trees in Bryce Canyon](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/11/ticker_treegenomes_free.jpg?fit=860%2C460&ssl=1)
Ancestors of Douglas firs (Pseudotsuga menziesii), such as this one growing in Bryce Canyon National Park, and other conifers underwent genome duplication — adding extra copies of genetic material — around the time of the Permian-Triassic extinction.
Zheng Li