bi19 - GeneticTraits GeneticTraits Earlobe Earlobe...

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Genetic Traits Genetic Traits
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Earlobe Earlobe Attachment Attachment
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Some scientists have reported that  this trait is due to a single gene  for which unattached earlobes is  dominant and an attached earlobe  is recessive. Other scientists have  reported that this trait is probably  due to several genes.
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Thumb  Thumb  Extension Extension
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This trait is reportedly due to a  single gene; strait thumb is  dominant and hitchhiker's thumb  is recessive.
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Tongue  Tongue  Rolling Rolling
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Tongue rolling ability may be due  to a single gene with the ability to  roll the tongue a dominant trait  and the lack of tongue rolling  ability a recessive trait.However,  many twins do not share the trait,  so it may not be inherited.
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Dimples Dimples
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Dimples are reportedly due to a  single gene with dimples  dominant (people may exibit a  dimple on only one side of the  face) and a lack of dimples is  recessive.
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Handedness Handedness
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bi19 - GeneticTraits GeneticTraits Earlobe Earlobe...

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