What is the redshift of the Andromeda galaxy?
Slightly negative, so actually a blueshift.
The Andromeda galaxy is moving towards our galaxy and due to collide in about
Andromeda galaxy does not have redshift. Rather it has blueshift, which means Milkyway and Andromeda are coming closer and they are both members of our local galaxy group. As such in a few billion years from now, they are expected to merge.