What a biologist should do if she finds that different methods of analyzing the same data provide different estimates of the relationship among certain taxa. Introduction: The evolutionary relationship between different organisms and the history of different groups of organisms is depicted by an evolutionary tree. Several different analytical methods exist to depict this, thus giving different estimates of the relationship between different groups of organisms.

Question

Want to see the full answer?

Answer 1

Question

100%

Chapter 16, Problem 6PDT

Summary Introduction

To determine: What a biologist should do if she finds that different methods of analyzing the same data provide different estimates of the relationship among certain taxa.

Introduction: The evolutionary relationship between different organisms and the history of different groups of organisms is depicted by an evolutionary tree. Several different analytical methods exist to depict this, thus giving different estimates of the relationship between different groups of organisms.

Summary Introduction

To determine: What a biologist should do if she finds that different methods of analyzing the same data give the same estimate of the relationship among certain taxa but the estimates differ depending on which of the two different genes has been sequenced.

Introduction: In phylogenetics, the relationship between different groups of organisms is studied. The evolutionary relationship between different organisms and the history of different groups of organisms is depicted by an evolutionary tree. Several different analytical methods exist to depict this, thus giving different estimates of the relationship between different groups of organisms.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

Since nucleotide sequences are more variable than amino acid sequences, you’ll use GAPDH nucleotide sequences to compare across the six taxa you’re analyzing. Suppose that you used BLAST to align all possible pairs of GAPDH sequences among lancelet, lamprey, bass, frog, turtle, and leopard. You would be able to construct the following table showing the percent similarity values across all six taxa. Leopard Turtle Frog Bass Lamprey Lancelet Leopard 100% 83% 80% 81% 76% 74% Turtle – 100% 79% 79% 74% 72% Frog – – 100% 79% 74% 71% Bass – – – 100% 77% 74% Lamprey – – – – 100% 73% Lancelet – – – – – 100% Now you can use this data (similarly to how you used the data in the character table) to build a phylogenetic tree. The distance between species in a tree is directly related to the amount of similarity between their gene sequences. For instance, two species will be closer together if the amount of similarity is high, or far apart if the amount of similarity is low. Which…

"Ancestry tests" are sold by many companies. There are significant limitations to these tests. Why is this the case? High rates of gene flow between populations reduce the reliability with which any sequence can demonstrate membership in one particular population. Evaluating too few genetic loci, of which just a small number happen to be similar, can lead to the conclusion that individuals are much more genetically similar than they actually are. A DNA match between two individuals living today is not a match with an ancestor. Rather, it suggests that the two people may have inherited the DNA sequence from a common ancestor. all of these are limitations to "Ancestry tests" O High genetic variation among individuals within most populations makes it difficult to identify specific sequences that can reliably indicate membership in a population.

For the trichome selection experiment, the null hypothesis is that there will be no difference between the mean number of trichomes in the second generation compared to the parent generation. The following bar graph shows the data from the experiment, including error bars showing ± 2 standard deviations (a measure of variation for a group of data as a whole). Based on the data provided, do you reject or fail to reject the null hypothesis? Select the answer that most strongly supports your choice and correctly justifies the response. Based on the data provided, do you reject or fail to reject the null hypothesis? Select the answer that most strongly supports your choice and correctly justifies the response. A. Reject the null hypothesis, as variation, shown by the error bars, is greater after selection. B. Reject the null hypothesis, as there is no overlap between the means as shown by the error bars. C. Reject the null hypothesis, as the error bars for the two groups show…