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Cliffg37
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OK, so I have been a Physics teacher for 23 years, During that time I have had in my class five sets of identical twins. I took College Biology, but my knowledge of genetics pretty much stops there, I am more of a Physics Scientist by far.

In each case, as the year goes along, I start to notice the subtle differences that allow me to tell the two apart. Sometimes it is obvious like one wearing braces and one not. Sometimes it is a subtle difference in an earlobe or some such. One set I could not tell apart ever, and if I saw them today, probably would still not be able to.

But here is a shocker and I wonder if anyone can explain this to me. I have no clue how this could be. My current set of identical twins look very much alike, After several months I can tell them apart.... but I noticed today that only one of them is left handed? I thought handedness was genetic for sure.

Any thoughts?
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LobowolfXXX
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My guess would be they're genetically ambidextrous, or virtually so, and by design or chance, drifted down different paths.
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Marlin1894
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Of course one is left handed and the other right handed, they are mirror images of each other!

Seriously though, I don't think handedness is genetic. It doesn't seem to hold true along family lines, in fact I believe even when a mother and father are both left handed, they still more likely to produce a right handed child. I'm pretty sure they have pretty much ruled out the genetic link by specifically studying identical twins. Or at least they have found if there is a genetic link, it's a very complex one. Not as straightforward as eye color for example.
critter
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I know many people who have told me that they were born left handed but it was trained out of them. I was ambidextrous until 2nd or 3rd grade when they wouldn't let me use the left handed scissors or write left handed in school anymore. I never had much difficulty learning weapons movements with either hand during martial arts classes, but I don't write well with my left hand now.
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tommy
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What you have noticed may not be what you think. I, like many others, do many things left handed and many other things right handed, but I am nether left handed nor ambidextrous.
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Cliffg37
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Agreed Tommy. I am not ambidextrous. I write with my right hand, and always have, but my left hand is stronger, and I tend to swing a hockey stick left handed. I never tried to do that, it just seemed natural at age 12 the first time I picked one up. I tend to be left handed for strength and right handed for dexterity. The twins were both writing which is why I noticed.
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mastermindreader
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Stringed instrument players, like myself, can relate to this. Those of us who are right-handed nonetheless do all of the fingering with our left hands.

In magic and mentalism there are some sleights that I do mainly with my left hand (one-handed seconds and bottoms as well as the primary movements in shifts), while others I do mainly with my right. With billet and swami work I'm comfortable with either hand.

It is wrong, I think, to judge handedness simply by which hand we were trained to write with.

It seems more learned than genetic to me.
Marlin1894
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Quote:
On Apr 3, 2014, mastermindreader wrote:

It seems more learned than genetic to me.


I believe here is probably some natural component to it. But a person can definitely be trained, or may even learn on their own to become proficient with both hands, or one hand over the other.

Phil Mickelson is the greatest left handed golfer of all time, even thogfuh he is right handed for everything else. He learned the golf swing my mirroring his father at a very young age. Mike Weir won a Masters playing left handed and he's a righty as well. Mickey Mantle and Pete Rose basically drilled themselves into becoming a couple of the greatest switch hitters of all times. Etc.

I wonder if vision plays a part in it. I'm right handed but I have cross eye dominance. I shoot trap right handed and do fine because I've been doing it for a long time, but if I had been coached as a kid they almost certainly would have tried to convert me to a left hand shot. I shoot with one eye closed which almost nobody does. But I can't shoot ducks with one eye closed.
lynnef
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Interesting sidenote is comedian Demitri Martin who writes and draws with both hands at the same time, Lynn
AllAboutMagic
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Quote:
On Apr 3, 2014, mastermindreader wrote:
Those of us who are right-handed nonetheless do all of the fingering with our left hands.


Ummmmmm..........speak for yourself Bob!
mastermindreader
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It all depends on what instrument I'm playing!
Chessmann
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I recall no influences to left- or right-handedness or footedness, ever.

I write with my left hand.
I throw, bat, golf, play tennis, etc..., with my right hand - though tennis is ok with my left hand.
I eat with my left hand (use a fork with it)
I kick with my left foot (though I believe I'm better with my right than many right-footed players are with their left - I gleaned this from many years of playing soccer).

My parents were right-handed, as is my brother (my only sibling). I know of only 1 or 2 relatives (outside of immediate family) who were left-handed.
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landmark
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Remember that some human characteristics are determined not immediately by parents' genes, but conditions in the womb during pregnancy. I have no idea if handedness is one of those, however. I have one left-handed sibling out of five. I'm right-handed, but just about any coin sleight I do better with my non-dominant left hand.
critter
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I actually did everything with both hands until I was forced to use only my right. My handwriting was even slightly better with my left hand, as I recall.
"The fool is one who doesn't know what you have just found out."
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Bluesman
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I am a identical twin. When my father give me my first guitar at the age of six. I played it left handed till I got some guitar books. All the books were written for right hand guitar's player. So I learn to play it right handed. Sometimes I still pick up my guitar as if I were left handed.
mastermindreader
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Bluesman-

That's kind of what I was referring to earlier. With the guitar, as with most other stringed instruments, the left hand work is just as difficult, if not more so, that the right. So I've never really understood why such instruments are referred to as right-handed.

I do know why, however, orchestral violinists all play right handed. It's because if you didn't, you'd poke the guy next to you in the eye with your bow.
Marlin1894
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A couple of years ago I heard that some company was making full sized left handed pianos.
Bluesman
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Quote:
On Apr 4, 2014, mastermindreader wrote:



I do know why, however, orchestral violinists all play right handed. It's because if you didn't, you'd poke the guy next to you in the eye with your bow.



Now that was funny! Smile
Cliffg37
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I saw that on one of the funny home video shows. A guy dancing around playing a violin at a wedding reception accidently pokes a waiter in the face with the bow. The waiter wipes out with his tray of food.
Magic is like Science,
Both are fun if you do it right!
EsnRedshirt
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Quote:
On Apr 4, 2014, mastermindreader wrote:
Bluesman-

That's kind of what I was referring to earlier. With the guitar, as with most other stringed instruments, the left hand work is just as difficult, if not more so, that the right. So I've never really understood why such instruments are referred to as right-handed.

I do know why, however, orchestral violinists all play right handed. It's because if you didn't, you'd poke the guy next to you in the eye with your bow.

My understanding was that (at least for picked instruments like guitar) your dominant hand can strum better and faster. But it's a matter of personal preference.

Myself, I played piano and drums, where there isn't exactly a dominant hand, for the most part.
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