The Smiths have four children, all girls. Their fifth child is a boy. Why did this change occur?
A) the father' contribution of a Y chromosome.
B) the conception classes taken by the parents.
C) the mother' contribution of a Y chromosome.
D) the timing of the fertility cycles.
3 years ago
Best Answer - Chosen by Voters
The answer in this case happens to be A. But really, you ought to do your own homework...you're not going to learn otherwise!
Because one of Mr. Smith's sperm, carrying a Y chromosome, fertilized his wife's egg.
Read more: http://wiki.answers.com/Q/The_Smiths_hav...
this is correct
This happens all the time
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