1. Huntingtons disease is a human malady caused by a dominant allele that is not
ID: 14729 • Letter: 1
Question
1. Huntingtons disease is a human malady caused by a dominant allele that is not expressed until a person reaches middle adulthood. Cystic fibrosis is caused by a recessive allele at a different locus. Choose the letters you want to use for symbols and give the possible genotypes for each of these individuals.A) a young person who will get Huntingtons later in life
B) a person who does not have the genes for Huntingtons or for Cystic fibrosis.
C) a person with cystic fibrosis who will not develop Huntingtons.
Explanation / Answer
H, h - Huntingtons disease C, c - Cystic fibrosis A) a young person who will get Huntingtons later in life genotypes = HH, Hh, HC, Hc B) a person who does not have the genes for Huntingtons or for Cystic fibrosis. genotypes = hC, CC, Cc C) a person with cystic fibrosis who will not develop Huntingtons. genotypes = hc, cc
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