Courtneys Replacment Blog Should be #3

What We Did Today:
~Mendilian Genetics written reponse section
~Chapter 19.1 and 19.2 quiz on thurs
~Started the DNA section
~Movie on Tay Sachs

Thoughts On The Material:
Today was a petty simple day.  We wrote the written reponse and i thought i was simple, but then i realized i forgot alot of stuff so maybe it wasnt so easy.  I still have to wrie the mumltiple choice which i hope goes well.  We watched a little movie about a boy Hayden who has a rare disase called Tay Sachs. I didnt like that at all, i felt so bad for that little boy.  While watching it i started to wondering how it could be only one letter that could affect someone soo greatly?

Above and Beyond:
This website http://en.wikipedia.org/wiki/Tay-Sachs_disease says that it is an autosomal esive trait.  If only one gene is deformed, or mutated it can cause this.  This gene is located on chromosome 15.  So if that gene is wrong from both parents (since it is ressive) the child will have Tay Sachs. Both parents can carry it if they are heterozygous they can pass it on without having the disease.