Evolution homework assignment (HELP PLEASE!!!!!!!!!!!!!!!) Name of article: New

Question

Evolution homework assignment (HELP PLEASE!!!!!!!!!!!!!!!)

Name of article: New Developmental Evidence Clarifies the Evolution of Wrist Bones in the Dinosaur–Bird Transition

- Summarize and explain what the article is about! (CAN SOMONE PLEASE HELP ON THIS!!!!)

- What are the authors views?

- What methods were used?

- Most interesting part of article?

- The article is provided below in the web link (copy and paste it will direct you to the article)

http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1001957

Explanation / Answer

Summary: Here, the author is trying to develop a relationship between birds and dinosaurs. He further says that from early dinosaurs with as many as nine wrist bones, modern birds evolved to develop only four ossifications. When birds diverged from nonavian dinosaurs, the key adaptations for flight involved a remodeling of the bones of the wrist. To identify the bones in the bird wrist, data can be drawn from two radically different sources: (1) embryology and
(2) the fossil record of the dinosaur-bird transition.
This integrative approach resolves previous disparities that have challenged the support for the dinosaur-bird link and reveals previously undetected processes, including loss, fusion, and in one case, re-evolution of a transiently lost bone.
The article basically deals with the knowledge and data collection to know that the modern birds are evolved from the dinosaurs only. There are few studies done to get the information about the same.

Author's views are: The study integrates developmental and paleontological data and clarifies the relationship between each of these four ossifications and those found in nonavian dinosaurs.

Methods used:
1. Experimental Animals and Museum Collections?
2. Cartilage Staining?
3. Serial Histological Sections?
4. Whole-Mount Immunofluorescence

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