What factor is NOT a characteristic resulting from the domestication of the silkworm?

Question

BlackTom AI · Accepted Answer

Domesticated Bombyx mori (the silk moth) show reduced mobility and pigmentation but retain basic light perception, so "Blind" is not a characteristic produced by domestication.

1. Relevant knowledge points and concepts
- Domestication selects traits favorable to humans (reduced escape ability, higher yield, easier handling).
- Bombyx mori has been domesticated for thousands of years for silk production, producing predictable morphological and behavioral changes: wing reduction, flightlessness, and loss or reduction of pigmentation (lighter/white cocoons and larvae).
- Insects have simple eyes (ocelli/compound structures) for light detection; complete loss of vision is not a typical result of silkworm domestication.

2. Step-by-step reasoning
- Humans favored moths that could be easily reared and could not escape; over generations this selected for reduced wing musculature and wing morphology → loss of wings or wing reduction and inability to fly.
- Selection for white cocoons (easier processing and dyeing) produced depigmented strains → loss of color is a documented domestication trait.
- Despite reductions in mobility and changes in coloration, there is no widespread documented loss of photoreceptors or complete blindness; silkworm larvae and adults still respond to light cues used in feeding, molting, and mating behaviors.

3. Calculations
- None required for this conceptual question.

4. Why the correct answer is correct
- "Blind" is not a characteristic resulting from domestication because silkworms retain functional light-detecting organs; domestication altered morphology and pigmentation but did not eliminate basic photoreception.

5. Why the other options are incorrect
- Loss of wings: correct as a domestication-derived trait (especially in females).
- Inability to fly: correct; many domesticated strains are flightless.
- Loss of color: correct; selection produced lighter/white cocoons and larvae.

6. Conclusion
Therefore, the factor NOT resulting from domestication is "Blind," which matches the provided correct answer.

What factor is NOT a characteristic resulting from the domestication of the silkworm?单项选择题

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