Is it possible to be genetically right handed but be born without a right arm?

I was just wondering about this. If someone is genetically right handed but is born without their right arm, would they have difficulty learning to write? Would it be harder, or would they just learn to write with their left hand just as easily as they would with their right hand?

No, not really. It's more of a habit actually. I was born as left handed, at the age of 5 and 6 I was able to write and draw with both hands equally and now I'm right handed (probably because I didn't want to be the only left handed in my class). There is no special rule, the hand you use the most becomes your "Good Hand".

So, if one is born without one's right arm, one will start writing with the only arm one has, and therefore, one will be left handed.