We do not know the identity of the genes responsible for variation in beak size

Question

We do not know the identity of the genes responsible for variation in beak size among medium ground finches. However, Otger Campàs and colleagues (2010), extending earlier work by Arhat Abzhanov and coworkers (2004), of- fered a clue. Campàs and colleagues focused on a growth factor, bone morphogenic pro- tein 4 (BMP4), known to be active during embryonic development. BMP4 is a signaling molecule that helps sculpt the shape of bird beaks (Wu et al. 2004). For each of the six species of ground finch, the researchers treated three embryos of a particular developmental age with a fluorescent probe that binds to messenger RNA made by Bmp4, the gene encoding BMP4. For each embryo, the scientists

Explanation / Answer

The answer is

E)only statements i,ii,iii,iv convery accurate information because Bmp4 is never transcribed earlier in the image and there are no quanities of transcribtion at all in this case .

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