The Next Few Questions Refer to the Following Description

question 62

Multiple Choice

The next few questions refer to the following description.
On the volcanic, equatorial West African island of Sao Tomé, two species of fruit fly exist. Drosophila yakuba inhabits the island's lowlands, and is also found on the African mainland, located about 200 miles away. At higher elevations, and only on Sao Tomé, is found the very closely related Drosophila santomea. The two species can hybridize, though male hybrids are sterile. A hybrid zone exists at middle elevations, though hybrids there are greatly outnumbered by D. santomea. Studies of the two species' nuclear genomes reveal that D. yakuba on the island is more closely related to mainland D. yakuba than to D. santomea (2n = 4 in both species) . Sao Tomé rose from the Atlantic Ocean about 14 million years ago.
-Using only the information provided in the paragraph, which of the following is the best initial hypothesis for how D. santomea descended from D. yakuba?

• A) geographic isolation
• B) autopolyploidy
• C) habitat differentiation
• D) sexual selection
• E) allopolyploidy

Grasp the concept and importance of antigen presentation.

Appreciate the distinctions between innate and adaptive immunity.

Discuss the role of inflammation in the immune response.

Comprehend the mechanisms leading to active immunity.

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Definitions:

Unified National Fine

A standard for threading that specifies a fine thread pitch, commonly used in bolts, screws, and nuts in North American engineering applications.

M

In machining and engineering, "M" often refers to a metric specification or the designation for milling operations in G-code programming.

Square Bar

A type of metal or wooden bar with a square cross-section.

Welding Symbol

Symbols used on blueprints and technical drawings to indicate the type, size, and length of welds used in the fabrication of metal parts.