Hey. THis isn't about me, but a genetics q. on a friend.
Stop me if i'm wrong, but I always thought that to have left handedness,
you need to recesive left genes l l If you have an R then it is
dominient, and takes over. This girls mum is left handed, and must have l
l So is her dad. Her brother is also left handed, having taken an l from
one, and an l from the other. His sister, is right handed. But?? If she
is, she must be R l or R r, and have taken a right from a parent. But the
parent can't have a right, or they'll be right handed too. So I'm thinking
that its not as simple as it looks. But can you try and explain?
Its been bugging me fer a while now.
Handedness is not necessarily inherited.
It's not as simple as it looks. The genetics of handedness is not fully
understood. It's not as simple as right-dominant/left-recessive. There are
theories involving several genes combining to produce the handedness trait,
but the genes responsible have not been identified.
Richard E. Barrans Jr.
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Update: June 2012