Weismann cut off tails of mice generation after generation but tails neither disppeared nor shortened showing that

Weismann cut off tails of mice generation after generation but tails neither disappeared nor shortened showing that :

Weismann cut off tails of mice generation after generation but tails neither disappeared nor shortened showing that :

Weismann cut off tails of mice generation after generation but tails neither disappeared nor shortened showing that :

Weismann cut the tail of mice for