Answer Choices
A) confirmed when beak formation in an embryonic bird typically begins.
identified particular genes that could initiate beak formation in birds.
proved that beak formation in birds was a response to external conditions.
pinpointed the primary gene that activates the development of a bird's beak.
Explanation for Question 26 From the Reading Section on the 2021 May Sat (International)
Hey guys. So the question 26 says, 2 according to the passage, the earlier studies that Buhler consulted were important 3 primarily because they blank. So let's go back and find, 4 okay, where are they talking about referring to earlier studies? 5 And when does that come in? And then what follows from that? 6 Well, just reading through it here, 7 it says that so bowler searched for earlier studies of genetic pathways. 8 So this is coming after he's saying like, here's this intermediate step showing how, 9 um, they were shifting slowly towards beaks. 10 And now he's saying we were looking for earlier studies of genetic pathways that 11 control development of these bones. So earlier studies to show genetic pathways 12 that control development of these bones. So these earlier studies are made to look 13 directly at these genetic pathways. 14 Now, when they're working in mice and chickens, 15 they implicated two sets of signals, 16 a gene called fiberglass growth factor. 17 A the FGF eight becomes active and later a 18 gene called w N T becomes active. 19 So they're saying that in figuring out these gene pathways, 20 they noticed that these two became, 21 um, active. These two signals, 22 um, were what were important when they look at earlier studies, 23 they were able to realize this. And then later on, 24 they go on to test these two things, to see if do those like 25 play a role in what we're looking at. So based on that, 26 it seems to be that they're, you know, getting evide...