Alison Van Eenennaam (University of California, Davis): Gene editing is a molecular technique whereby breeders can go in and make very precise double-stranded breaks in the DNA at a particular gene, or genetic loci. And a number of results can happen. You can knock a gene out; for example, maybe a gene where a virus gains entry, so you would make a disease resistant animal in that particular example. Or you might do what’s called “allele substitution”. So you might bring the polled allele in from beef cattle, Angus for example, into horned dairy cattle so that at that particular loci they now have the polled allele and would be genetically de-horned.
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