Curved thumb

TaroLover tarolove at
Mon Oct 14 08:36:13 EST 1996

My student is a twin, he has a right curved thumb and left straight
thumb. But his elder btother has a left curved thumb and right
straight thumb. But their father and mother are both right straight
thumb and left straight thumb.

How to explain the above event?

Would any Biology experts can answer my question, please send me a
E-mail. Thank You! :)

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