10. The cyprinids are a freshwater fish family comprised of the genera Notropis,
ID: 191792 • Letter: 1
Question
10. The cyprinids are a freshwater fish family comprised of the genera Notropis, Rhinichthys. Campostoma, Cyprinus, and Lythrurus. In the phylogenetic analysis of serval fish genera including cyprinids below, which numbered node represents the most recent common ancestor of the syprininds? Cottus Etheostoma Ictalurus Notropis Rhinychthys Campostoma Lythrurus Etheostoma Perca a. 6 b. 4 c. 3 e. 2 41. Which of the trees below represents the currently accepted pattern of relationships among the taxa shown? B Firmicutes Basidiomycota Mammalia Mammalia Mammalia D Basidiomycota Basidiomycota Firmicutes Firmicutes MammaliaExplanation / Answer
As given in the first figure, Cyprinus is connected to a group of species (Rhinychthys, Campostoma, Lythrurus and Etheostoma) by node 4 where the closest and in that way a recent attachment to Cyprinus comes. So the answer should be 4.
In the second figure, the different groups which are given are:
Basidiomycota: a type of fungus and thus they are eukaryotic in nature.
Firmicutes: A type of bacteria which indicates the cells being primitive and prokaryotic
Mammalia: The whole mammalian kingdom (Eukaryotic)
Proteobacteria: Also constitutes of bacteria (primitive cells)
The information given above can help us understand that the prokaryotic would be on one branch of the phylogenetic tree and eukaryote on the other. So, the answer is A
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