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1.
Birbal Sahni was
2.
England in 1850s, 
before industrialization set in, it was observed that there were more white-winged moths on trees than dark-winged or melanised moths.However, in the collection carried out from the same area, but after industrialization, in 1920, there were more dark-winged moths in the same area, the proportion was reversed
Predict the possible reason for such change
before industrialization set in, it was observed that there were more white-winged moths on trees than dark-winged or melanised moths.However, in the collection carried out from the same area, but after industrialization, in 1920, there were more dark-winged moths in the same area, the proportion was reversedPredict the possible reason for such change
3.
In a given population, the ...A... of occurrence of alleles of a gene is supposed to remain ...B... and even remain the same through generations. Hardy-Weinberg principle stated it using ...C... equation
Choose the correct option for A, B and C to complete the given NCERT statement
Choose the correct option for A, B and C to complete the given NCERT statement