Easy, the answer is neither. It's elementary my dear Watson, assuming it's the same as it is in humans, both parents have two sex chromosomes with the female having two copies of the Y chromosome and the male having one copy of the X chromosome and one of the Y. During normal development each individual baby gets a copy of one of each parents chromosomes. This means it always gets a copy of the Y chromosome from its mother and the chromosome inherited from the father determines the sex of the offspring with 50% being males and 50% being females statistically speaking.
Edit: welp, looks like I was ninja'd because I tried to get all sciency and stuff