Malformations and mutations are a normal part of evolution. How many malformations are found these days, how many were found shortly after Tchernobyl, and how many before Tchernobyl?

If you read reports on Tchernobyl as it is today, plants seem to have adjusted to radioactivity fairly well, and with much less problems than animals. As such one would expect to see during Tchernobyl itself many more reports on mutations in animals than in plants, even more so as animals ar probably better overseen (e.g. farmers). Not to speak of humans, where for instance leucemia and trisomy-21 (down syndrom) should have increased by a lot. Nothing to that end was registered.