Answer
Joseph Stalin was in favor of Trofim Lysenko's criticism of Nikolai Vavilov's theories. Stalin supported Lysenko's theories because they were more in line with Marxist-Leninist ideology. Lysenko's theories claimed that environmental factors, rather than genetic factors, were the primary cause of variation in organisms. This was in contrast to Vavilov's theories, which held that genetic factors were the primary cause of variation.