Cladograms and Phylogenetic Trees

Front

What is a cladogram?

Back

A cladogram is a diagram that shows the evolutionary relationships among a group of organisms, illustrating how they are related through common ancestors.

Front

What is a phylogenetic tree?

Back

A phylogenetic tree is a branching diagram that represents the evolutionary history of a group of organisms, showing how species are related through evolution.

Front

What are derived characteristics?

Back

Derived characteristics are traits that are present in an organism but were absent in the last common ancestor of the group being studied.

Front

Why are advantageous traits more likely to be passed onto offspring?

Back

Because they are more likely to survive and reproduce.

Front

What does it mean for organisms to share a common ancestor?

Back

It means that they have evolved from a species that existed in the past, from which they have diverged over time.

Front

How can you determine the closest relative of an organism on a cladogram?

Back

The closest relative is found by looking for the organism that shares the most recent common ancestor with the organism in question.

Front

What is the significance of the root of a phylogenetic tree?

Back

The root of a phylogenetic tree represents the most recent common ancestor of all the organisms depicted in the tree.

Front

What is the difference between homologous and analogous structures?

Back

Homologous structures are similar due to shared ancestry, while analogous structures are similar due to convergent evolution, not shared ancestry.

Front

What role do fossils play in understanding cladograms?

Back

Fossils provide evidence of past organisms and their characteristics, helping scientists determine evolutionary relationships.

Front

What is the importance of genetic data in constructing phylogenetic trees?

Back

Genetic data helps to clarify relationships between species by providing information on their evolutionary history at a molecular level.