30% of organism's genetic material swapped for engineered replacements

A global research team has built five new synthetic yeast chromosomes, meaning that 30 percent of a key organism's genetic material has now been swapped out for engineered replacements. Like computer programmers, scientists add swaths of synthetic DNA to -- or remove stretches from -- human, plant, bacterial or yeast chromosomes in hopes of averting disease, manufacturing medicines, or making food more nutritious.

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