Mendel was able to devise the law of [blank1] because all of…

Mendel was able to devise the law of [blank1] because all of the genes for the traits he looked at were on different chromosomes.  If two genes are on the same chromosome, they may be passed into gametes together, giving unexpected phenotypic ratios in the offspring.  This is known as [blank2]. 

Huntington’s disease is a progressive neurodegenerative dise…

Huntington’s disease is a progressive neurodegenerative disease in which symptoms typically appear starting in middle age. It is inherited in an autosomal dominant fashion. A man has an aunt with Huntington’s; the aunt is his mother’s sister.  The man’s mother died in a car accident when she was fairly young, before symptoms of the disease typically manifest.  Before having children of his own, should the man be tested for Huntington’s? Why?