How come I got a yellow rose on a red rose bush?

I've had this rose bush for several years, and it's always produced red roses.

How come I got a yellow rose on a red rose bush?
sometimes roses do this. if you don't want the yellow and red prune the yellow branch off to remove.





this is called a 'sport' and sometimes you can propogate if it is excellent and start a new rose variety. this is what happened to 'Iceberg' roses. a white Iceberg rose suddenly had a branch with a pink flower and a new variety was created. Now sold all over the world.
Reply:i have no idea, but your question made me laugh and reminded me of the "we're painting the roses red" song from disney's alice in wonderland. maybe it has something to do with pollination?
Reply:Could a shoot have come up from the rootstock? Roses are usually grafted onto a sturdy rootstock of a different variety.
Reply:Genetic mutation or it has gotten pollen from another rose nearby from a bee.
Reply:Cross pollenation.
Reply:it got pollen from a yellow rose bush