"Why did God need to use a rib to create Eve?"

Genesis 2:21-22 So the Lord God caused a deep sleep to fall upon the man, and while he slept took one of his ribs and closed up its place with flesh. And the rib that the Lord God had taken from the man he made into a woman and brought her to the man.

When God creates Adam, the Bible says he created him from dust and then breathed life into him. Why then, when it comes to the creation of Eve, does God have to use a rib? Could he have used one of adams fingers, or his tailbone? Why did he need anything from Adam at all? 

There is also the biological question of how could Adam's rib, which contained Adam's DNA, have created anything other than a copy of Adam?

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