Evidence for Evolution and Phylogenetic Analysis Study Guide

What is considered the unifying principle of biology?

Evolution is considered the unifying principle of biology, as it explains the diversity of life and the changes over time.

What does embryology study?

Embryology studies the development of single-celled embryos and observes similarities in initial forms of different species.

What is the Law of Superposition?

The Law of Superposition states that in undisturbed rock layers, older layers are located below younger layers.

What are homologous structures?

Homologous structures are anatomical features that are similar due to shared ancestry but have different purposes based on environmental adaptations.

What is the significance of DNA sequence comparison in evolution?

DNA sequence comparison reveals high similarity between species, suggesting a common ancestor and allowing for further research into evolutionary divergence.

What are phylogenies?

Phylogenies are tree-like diagrams that represent evolutionary relationships based on shared traits and similarities in DNA among species.

What does a node represent in a phylogenetic tree?

A node represents the most recent common ancestor (MRCA) of the species on the tree.

What is the difference between homologous and analogous structures?

Homologous structures share a common ancestor, while analogous structures have similar traits that evolved independently without a shared ancestor.

How do primate thumbs and panda 'thumbs' illustrate analogy vs homology?

Primate thumbs are homologous traits due to a common ancestor, while panda 'thumbs' are considered analogous as they evolved independently.