A model that had a single common ancestor and allowed for some gene - swapping among species was even better than a simple tree of life.
一个拥有单一共同祖先且允许物种间部分基因彼此交换的模式甚至更优于树形生命模式。
2
Any new flu carries the risk of gene-swapping that can form mutant viruses, and this one has some swine and avian genes that, before this April, had never been seen in humans.
Zinc-finger nucleases are enzymes that can be designed to find specific DNA sequences in the genome and cut them out, deleting those sequences or swapping one gene for another.