Question
If a couple has three daughters already, what is the probability, based on the chapter's model, that their next child will also be a girl? X-bearing or Y-bearing sperm
0%, since they've already had three girls
Approximately 50%, since each conception is an independent event with roughly equal odds of
100%, guaranteed to be a girl
It depends on how many boys they have had previously
Detailed Explanation
Each conception is an independent event; since sperm carrying X or Y occur in roughly equal proportion, the odds of a girl remain about 50%, regardless of previous children's sexes.