Explanation for Question 28 From the Reading Section on the 2018 May Sat
Question number 28 says according to the passage, 2 the discovery that some genes and domestic cats influence the migration of neural 3 crest cells is important because neural crest cells are what 4 so what we're looking for here is the significance of this 5 neural crest cells finding. So it looked back at the passage, 6 the part where it neural crest cells are really being discussed is down here. 7 Um, the team found five genes that influenced the migration of neural crest cells. 8 We say that these are stem cells in the developing embryo that affect everything 9 from skull shape to coat color. So this is sort of their exact 10 definition, but remember, we're looking for the importance, 11 the significance of it. So we're going to keep reading, 12 we see that such cells, maybe the master control switches of domestication. 13 So this detail here, master control switches. 14 That's really what we're looking for. 15 That's the key importance, the significance of why do these neural 16 crest cells matter? Why does it matter that these genes are influencing their migration? 17 Um, so this is really what we're looking at. 18 Their master control switches of domestication because of their role 19 as stem cells in the developing embryo. 20 So when we look at our answer choices, this seems to match up really 21 nicely with answer choice C, 22 that they are fundamental to the overall process of domestication of animals. 23 Remember they're referred to as those sort of master control ...