Question

Postlab 1: Introduction to Phylogeny and Tree-ThinkinB Directions Complete the questions below by the start time of your next lab. Be predse in your answers and pay attention to your reasoning. Your postlab is worth 5 points total. Use the following data matrix to answer the questions below. These data were collected as part of a conventions shown to you in lab this week to answer the questions. Great White (GW) IT-İAIcIG -[G- Tiger (T Hammerhead (H) | T | T | G | G | T İG Chimaera (C) 253,6 2. (0.5 pts) Which characterís) in the data matrix are parsimony uninformative? 3. (0.5 pts) Draw the three possible unrooted trees for the four taxa in the data matrb. 4. (0.5 pts) Map each informative character, correctly showing the changes on each tree. 5. Circle the most parsimonious tree (0.25 pts) and list the correct number of steps (0.25 pts). Tree 1 Tree 2 Tree 3 uo (A) GW C t) T (C) ccc) LG)

Answer 1

1. Based on the observed characteristics the phylogenetic inference can be based on the observed characteristics.The table illustrates that grey-white hammerhead Tiger and Chimaera shows SNPs variation in characters 2,3, and 6. Thus much evidence can be gained from these characters. Thus it is parsimony -informative data.

2. Based on the observed characteristics the phylogenetic inference can be based on the observed characteristics.The table illustrates that grey-white hammerhead and Tiger share characters 1 and 4 i.e conserved. So it will not help to deduce phylogeny inference and hence can be classified as parsimony-uninformative.