Subject: Can XYY males produce gametes containing YY or XY?

In a lecture we are studying aneuploidy of the sex chromosomes, one of the 
possibilitles being XYY. Whilst doing my background reading in "An Introduction 
To Genetic Analysis"  By Griffiths, Miller, Suzuki, Lewontin and Gelbert. 
Freeman Seventh Edition, I read "Their meioses are of the XY type; the extra y 
is not transmitted, and their gametes contain X or Y never YY or XY." But I 
have read elsewhere that they can.
Is this right, and if so why can't they? Is the same true of metafemales?

Re: Can XYY males produce gametes containing YY or XY?