In 1998,researchers Found That Genes Similar to the Drosophila Gene

question 47

Multiple Choice

In 1998,researchers found that genes similar to the Drosophila gene tinman are necessary for heart development in vertebrates.What can you conclude about the ancient bilaterian ancestor of insects and vertebrates over 500 million years ago?

• A)The fly species that eventually gave rise to vertebrates used tinman to make a heart.
• B)Something about heart development requires a gene to have a tinman-like sequence,but the vertebrate and invertebrate genes arose by convergent evolution -- so the ancestor had a similar but not homologous gene.
• C)The ancient ancestor lacked a heart,but already had a tinman-like gene.
• D)The ancestor had a heart-like structure that was specified by a tinman-like gene.

---

Definitions:

Military Interventions

Military interventions are actions undertaken by a nation's military forces to intervene in the affairs of another country, often to enforce international mandates, protect interests, or support allies.

Stability

The state of being steady and unchanging, often used to describe economic, political, or social conditions that are consistently reliable and free from upheaval or disorder.

Panama Canal Zone

The small strip of land on either side of the Panama Canal. The Canal Zone was under U.S. control from 1903 to 1979 as a result of Theodore Roosevelt’s assistance in engineering a coup in Colombia that established Panama’s independence.

International Progressivism

A political and social movement that advocates for reforms on a global scale, focusing on issues like environmental protection, human rights, and economic inequality.