What do all tigers have in common?
Stripes, fur, paws, menu... the only thing that is different is their coats!
Are lions and tigers evolved from a common ancestor cat like ancestor an example of micro evolution?
Tigers, Lions, Leopards, and Jaguars all belong to the genus Panthera, which are the cats that can roar. They probably all evolved from Viretailurus schaubi, but I don't know that for certain. The short answer to your question is that Lions and Tigers "probably" evolved from a common ancester. If you go back far enough in our evolutionary history, just about all animals share a common ancestor of some kind.
The only white tigers in Australia are ones in zoos. Australia has no native felids at all, and tigers are found only in Asia. White tigers are individuals of the Bengal tiger subspecies that have a genetic condition called leucism. They are not Siberian tigers, not albino, and not a unique species or subspecies - these are all common mistakes people make regarding them. In the wild, they rarely occur as leucism is passed on…