A good example of this, relating to the brain, is a trait called Huntington's Disease. Huntington's disease, is a neurodegenerative disorder that affects muscle coordination and results in cognitive decline and psychiatric problems. Caused by a marked degeneration of brain tissue, that's visible in this picture. Comparing a Huntington's Disease brain on the left to normal brain tissue here on the right. Typically, Huntington's Disease becomes noticeable in mid adult life. So if the allele for Hu
ntington's Disease is dominant. Then which of the following allele combinations would result in someone who actually displays Huntington's Disease? Remember, humans have two copies of every gene. We'll represent the allele for Huntington's Disease with the letters HD and the allele for normal brain function with the abbreviation NORM. Would it be somebody who has two HD alleles. An individual with one HD and one NORM allele or an individual with two NORM alleles. Go ahead and select any and all
answers that you think apply. [BLANK_AUDIO]
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