"Assume that a certain species with sex chromosomes R and S exist such that RR individuals develop as males and RS individuals develop a females. Which of the following mechanisms would most likely to compensate for the potential imbalance of sex chromosome gene products between males and females of this species?" A - Inactivation of one R chromosome in males B - Doubling transcription from the S chromosome in females C - Inactivation of the R chromosomes in females D - Doubling the transcription from the R chromosomes in males The answer is A. I understand AAMC's explanation - eliminating an R would make each individual only have one R - but, I don't understand why the others are wrong. Would A create 2RR and 2RS gene products? And that is the idea? If so, why doesn't C work? C would create RS and RS products also - which would be balanced. I think I'm just generally confused on this question, can someone translate it for me and show me how to think about this problem? Thanks.