NOTE POST-LAB QUESTIONS Question 18: The evolutionary history of a group of spec

Question

NOTE POST-LAB QUESTIONS Question 18: The evolutionary history of a group of species is called: Question 19: In the tree to the right, which group is more ancestral Question 20: In the same tree, which two groups are most closely related? Question 21: Which of the following would not be a good trait to help differentiate groups of organisms? Question 22: What type of traits are useful when constructing monophyletic clades? Question 23: A phylogenetic tree is a hypothesis about the evolutionary relationships between groups of organisms. a. True b. False Question 24: When constructing a phylogenetic tree, a scientist should only use mo- lecular (DNA) data. a. True b. False Question 25: The underlying premise of dladistics and phylogeny is that

Explanation / Answer

Phylogenetic Analysis:

This is the study of evolutionary relationships between the organisms that is closely related sharing a common ancestor or distantly related, to understand the evolutionary divergence of the organism.

Question: 18

The evolutionary history of a group of species is called phylogeny.

Question: 19

In the tree to the right which group is more ancestral?

In the tree given the most ancestral group is A

Question: 20

To the same tree, which two groups are most closely related?

In the tree C and D are closely related.

Question: 21

Which of the following would not be a good trait to help differentiate group of organisms?

Initially before sequencing techniques, scientist did the phylogenetic analysis based on the comparison of morphological traits.

Studying phylogenetic relationship with visual appearance is not the good trait to differentiate the group of organisms.

Recent sequencing techniques made DNA and protein sequences available to understand deep about the evolution.

Question: 22

What types of traits are useful when constructing monophyletic clades?

Monophyletic group is the organisms in the clade which share the common ancestors.

When constructing monophyletic clades the evolutionary change that has occurred between the organisms, for them to be present in the different clade is analysed.

Example: molecular pathways, genes present, structural differences, etc

Biological basis that has led to diversity is studied.

Question: 23

A phylogenetic tree is a hypothesis about the evolutionary relationships between groups of organisms.

True

Question: 24

When constructing a phylogenetic tree a scientist should use only a molecular genetic (DNA) data.

False - Phylogenetic analysis is also done using protein sequence data

Question: 25

The underlying premise of cladistics and phylogeny is that:

Cladistics method of phylogenetics is studying the primitive and the derived characteristics. It studies the loss or gain of the characters during evolution. Based on these the tree is constructed.

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