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Only in the 1930's was it realised that it is not attributes that are passed on but genes.
Only in the 1930's was it realised that it is not attributes that are passed on but genes.
Transcript -- Only in the 1930's was it realised that it is not attributes that are passed on but genes.
Transcript -- Only in the 1930's was it realised that it is not attributes that are passed on but genes.