Subjects of this lecture

6/15/03


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Table of Contents

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Subjects of this lecture

Taxonomy - is the science of classification of organisms.

Phylogenetics - WHY?

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From a common ancestor sequence, two

How we calculate the Degree of Divergence

Relationships of Phylogenetic Analysis and Sequences Analysis

Relationships of Phylogenetic Analysis and Sequences Analysis

Relationships of Phylogenetic Analysis and Sequences Analysis

Relationships of Phylogenetic Analysis and Sequences Analysis

What is a phylogenetic tree?

What is a phylogenetic tree?

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In a phylogenetic tree...

In a phylogenetic tree...

Tree structure

Slide taken from Dr. Itai Yanai

The Molecular Clock Hypothesis

Rooted Tree = Cladogram

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Slide taken from Dr. Itai Yanai

Rooted versus Unrooted

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Selecting sequences for phylogenetic analysis

Selecting sequences for phylogenetic analysis

Known Problems of Multiple Alignments

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Known Problems of Multiple Alignments

Selecting sequences for phylogenetic analysis

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Taken from Dr.Itai Yanai

Building Phylogenetic Trees

Statistical Methods

Statistical Methods

Taken from Dr. Itai Yanai

Taken from Dr. Itai Yanai

Statistical Methods

Character Based Methods

Character Based Methods

Character Based Methods - Maximum Parsimony

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Character Based Methods - Maximum Parsimony

Maximum Parsimony Methods are Available�

Character Based Methods - Maximum Likelihood

Character Based Methods - Maximum Likelihood

Maximum Likelihood method

Character Based Methods

Distances Matrix Methods

Distances Matrix Methods

Distances Matrix Methods

Distance method steps

Distance method steps

Distances Matrix Methods

Mutations as data source for evolutionary analysis

Correction of Distances between DNA sequences

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Mutations - Substitutions

Mutations - Substitutions

Mutations

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Substitution Mutations

Let's assume that..

Where do the mutations occur?

Correction of Distances between DNA sequences

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These evolutionary models improve the distance calculations between the sequences.

DNA Evolution Models

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How to draw Trees? (Building trees software)

A Tip...

Known problems of Phylogenetic Analysis

Known problems of Phylogenetic Analysis

Known problems of Phylogenetic Analysis

How many trees to build?

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Author: weizmann

Email: shifra.ben-dor@weizmann.ac.il