Open Question
Considering the phylogenetic assignment of Plasmodium falciparum, the malarial parasite, to the phylum Apicomplexa (see Figure 17.17), what might you speculate as to whether the parasite is susceptible to aminoglycoside antibiotics?
22. Evolutionary Genetics
Phylogenetic Trees
Struggling with Genetics?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following structures on a phylogenetic tree represents the evolutionary connections between organisms?
A
Internal node
B
Terminal node
C
Branches
D
Roots
Verified step by step guidance1
Understand the components of a phylogenetic tree: A phylogenetic tree is a diagram that represents evolutionary relationships among organisms. It consists of branches, nodes (both internal and terminal), and a root.
Define the internal node: An internal node represents a common ancestor from which two or more descendant groups diverge. It is a point where a single lineage splits into two or more lineages.
Define the terminal node: A terminal node, also known as a leaf or tip, represents the end of a lineage, typically corresponding to a species or a group of species.
Define the root: The root of a phylogenetic tree is the most ancestral branch point, representing the common ancestor of all the organisms in the tree.
Explain the role of branches: Branches in a phylogenetic tree connect nodes and represent the evolutionary pathways or connections between organisms. They illustrate the lineage from one node to another, showing how species or groups are related through evolutionary history.
Related Videos
Related Practice
Phylogenetic Trees practice set
Problem sets built by lead tutorsExpert video explanations