Part A - Reading a phylogenetic tree This is one possible phylogenetic tree repr

Question

Part A - Reading a phylogenetic tree This is one possible phylogenetic tree representing the relationships between some members of phylum Arthropoda. human body louse katydid flea horsefly dragonfly mayfly silverfish Adapted from Biology by Campbell and Reee Pearson Education, Inc. Use this phylogenetic tree and your knowledge of cladistics to determine the relationships between these species. Rank the species from most closely related to horseflies to most distantly related to horseflies. If two species are equally close in their relatedness to horseflies, overlap them. View Available Hint(s) Reset Help katydid mayfly human body louse silverfish flea dragonfly most closely related to horseflies most distantly related to horseflies

Explanation / Answer

Interpretation of the Phylogenetic tree: A common ancestor gives rise to two branches, one of which terminates with silverfish and the other bifurcates in two branches. One of the branches gives rise to dragonfly and mayfly; both of these make up one sister clade. The other branch further bifurcates to give rise to two sister clades, human body louse and katydid and flea and dragonfly. The closeness of the species can be determined by their positions on the Phylogenetic tree; the closer they are on a tree the closer they are in relation. Species in sister clades are the closest among all related species.

1) So the closest to horsefly is flea,

2) Then comes the sister clade of the parallel branch - human body louse and katydid- these will overlap as they are equally related to horsefly

3) Dragonfly and mayfly come next and overlap

4) Silverfish is the farthest and is the least related to horsefly

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