The Following Question Refers to This Hypothetical Situation

question 16

Multiple Choice

The following question refers to this hypothetical situation.
A female fly, full of fertilized eggs, is swept by high winds to an island far out to sea. She is the first fly to arrive on this island and the only fly to arrive in this way. Thousands of years later, her numerous offspring occupy the island, but none of them resembles her. There are, instead, several species, each of which eats only a certain type of food. None of the species can fly and their balancing organs (halteres) are now used in courtship displays. The male members of each species bear modified halteres that are unique in appearance to their species. Females bear vestigial halteres. The ranges of all of the daughter species overlap.
Fly species W, found in a certain part of the island, produces fertile offspring with species Y. Species W does not produce fertile offspring with species X or Z. If no other species can hybridize, then which of the following statements about species W and Y are true?
I.Species W and Y have genomes that are still similar enough for successful meiosis to occur in hybrid flies.
II.Species W and Y have more genetic similarity with each other than either did with the other two species.
III.Species W and Y may fuse into a single species if their hybrids remain fertile over the course of many generations.

• A) Only I is correct.
• B) Only II is correct.
• C) Only III is correct.
• D) I, II, and III are correct.

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Definitions:

Sensory Receptor

Specialized cells or cell parts that detect external or internal stimuli and transmit signals to sensory neurons.

Deep Pressure

A type of tactile input that is firm and usually applied to larger areas of the body, often used therapeutically to promote relaxation and decrease stress.

Light Touch

is a sensory perception triggered by a stimulus that lightly contacts the skin, allowing for the detection of texture, pressure, and vibration.

Pacinian Corpuscles

Pressure sensors in the skin and viscera, detecting mechanical changes and vibrations.