Can You Roll Your Tongue? Pedigree Practice

2010/12/13
By Ms Baker
Photo by Here's Kate; The ability to tongue-roll is an inherited trait.

Photo by Here's Kate; The ability to tongue-roll is an inherited trait. Can you tongue-roll? Can your parents?

Here are a couple of websites to help you practice analyzing pedigrees.  When you’re attempting to answer these problems you must first answer the following questions:

a) Is this a sex-linked trait or a non-sex linked trait?

b) Is this a dominant trait or a recessive trait?

  • http://extremebiology.net/blog Ms Baker

    Here is a link http://www.zerobio.com/drag_gr11/pedigree/pedigree_overview.htm to a website with more pedigree practice.

  • Anonymous

    This is a non-sex linked trait and is also a dominant gene because tongue rolling is determined by a dominant allele, called R. If one of your parents has R resulting in Rr you can inherit the trait or if just one parent has it resulting in Rr the trait is still able to be inherited. If you cannot roll your tongue, you are known as homozygous recessive or rr. http://en.allexperts.com/q/Genetics-1795/Genetics-5.htm

  • Gurk_14

    Just like Sabrina I agree this is a non-sex linked trait. If both of the parents have a dominant (Tt or TT) gene the offspring is likely to have the ability to roll the tongue. But if both of the parents can’t tongue roll, they must both be tt, and they can only have 1 kind of child when it comes to tongue rolling. So the chances are very low.
    http://www.thetech.org/genetics/ask.php?id=22

  • Gurk_14

    Just like Sabrina I agree this is a non-sex linked trait. If both of the parents have a dominant (Tt or TT) gene the offspring is likely to have the ability to roll the tongue. But if both of the parents can’t tongue roll, they must both be tt, and they can only have 1 kind of child when it comes to tongue rolling. So the chances are very low.
    http://www.thetech.org/genetics/ask.php?id=22

  • akflynn

    Well, based on the link attached to the end of your post, it appears that tongue rolling isn’t actually autosomal dominant as our textbooks and teachers would have us believe, and may actually be polygenic rather than a single gene (dominant/recessive) trait.

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