What two traits must be pleiotropic in order for sympatric speciation to occur in heliconius butterflies?

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project