When was the collection carried out that showed a reversal in the proportion of white:winged and dark-winged…

When was the collection carried out that showed a reversal in the proportion of white:winged and dark-winged moths?
  1. 1850s
  2. 1920s
  3. 1980s
  4. 2000s

Solution

The collection carried out after industrialisation, i.e., in 1920, showed a reversal in the proportion of white:winged and dark-winged moths.

Asked in: NCERT

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