How is The Hitchhiker's Thumb Trait Determined

Briefly explain in complete sentences how the Hitchhiker's thumb trait is determined using the following words: allele, dominant, recessive, homozygous, and heterozygous.

You may use this website:
http://learn.genetics.utah.edu/content/begin/tour/

Hitchhiker's thumb trait is a autosomal recessive trait. This means that in order for a person to have this trait they must carry both allele's ( for example a) of the trait, which is in essence means that the person must be homozygous recessive (for example aa) in order to have the trait. If they are heterozygous (for example: Aa) for the trait then they are only a carrier of the trait and do not have it.

If you need to find out if someone has the trait or not given the allele's of the couple then use a punnett square to figure out the chances of the person having the trait. Although if one is homozygous dominant (don't have the trait so AA) and the other is homozygous recessive (do have the trait so aa) then the child will only be a carrier of the trait.