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Since a father produces both X-bearing and Y-bearing sperm in roughly equal numbers, this means the father's gametes determine the child's sex through

Question
Since a father produces both X-bearing and Y-bearing sperm in roughly equal numbers, this means the father's gametes determine the child's sex through
which type of sperm (X-bearing or Y-bearing) fertilises the egg
which type of egg is produced by the mother
the temperature of the father's body
random chance unrelated to any chromosome
Answer
which type of sperm (X-bearing or Y-bearing) fertilises the egg
Detailed Explanation
Because the mother always contributes an X-bearing egg, it is the type of sperm (X-bearing or Y-bearing) that fertilises the egg that determines the child's sex.
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