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Asked by csanders88 - 2 years ago
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joensf Level 77
Answered 2 years ago
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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
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Meklar Meklar
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!

http://answers.yahoo.com/question/index?...



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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Compliments from
labarca Level 63
Answered 2 years ago
4
Mr. Smith's Y carrying sperm out swam all his rivals
and fertilized Mrs. Smith's egg.
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Gumboy Level 55 / fun guy
Answered 2 years ago
3
The 'Law of Averages' could explain it, since the random probability
for the fifth being male is p(5) = 1 in 2⁵, or 1 in 32.
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