3. In the radiation of a freshwater fish clade, differences in intestine length

Question

3. In the radiation of a freshwater fish clade, differences in intestine length are thought to reflect differences in diet (longer intestines for more herbivorous diets, shorter intestines for more carnivorous diets). Imagine we measured intestine length and determined herbiverous vs. carnivorous for 6 fish species from this clade, and found the pattern shown in the graph below. Draw a fully resolved phylogeny (no polytomies) for these 6 species in which the observed pattern is not determined by 6 independent data points, but instead is determined by 2 data points: one data point for species 1-3, and a second for species 4-6. (8 pts) 4 6 5 carnivorousherbivorous

Explanation / Answer

Carnivores have smaller intestine size than the herbivores because they have simpler digestive system and food taken by them are more easy to digest and easily absorbed in the intestine but herbivores have larger intestine and requires large surface for absorption of digestive food.Thats why species 1,2,3 have smaller intestine and 4,5,6 have larger intestine in lenght. Herbivores are more advanced than Carnivores intheir anatomy . These are developed from the Carnivores by advancement and increasing efficiency of the their physiology and other characters.

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