[PW] ? DNA question

[Mary Barna]

A patron had a second-hand question that she would like clarification
on.  I will try to explain it to the best of my ability.  She said that
her sister, in a college class, had a DNA sample taken.  When the
results were in, the Professor made a crack in front of the class that
her DNA had one female strand and two male strands (or lines?) and she
should "go home and talk to your mother."  The kid was devastated, since
her parents divorced partly because her father was not sure if he was
her father. (He is!)

The implication, that mom had sex with two guys that impregnated her one
egg, doesn't seem legit to me.  I have heard of fraternal twins having
different parents, but could this be a fact in this case?  It's an odd
question, I know.

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Mary Barna, Director
Valley Community Library
739 River Street
Peckville, PA  18452
phone (570) 489-1765  fax (570) 383-9657
email -- mbarna at albright.org
webpage -- www.lackawannacountylibrarysystem.org/valley
 
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