Ascientist wants to produce a cow that makes a particular human protein in its milk. the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. selective breeding b. genetic crosses c. cloning d. genetic engineering

The answer would be: D. genetic engineering

Selective breeding will only result in better genetic of cows, it will produce better cow protein, but not human protein. Cloning only produce a same genetic cow, not a new one. genetic engineering will allow the scientist to insert a human gene into the cow, makes them able to synthesize human proteins.