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If Huntington's disease is due to a dominant trait, shouldn't three-fourths of the population have Huntington's while one-fourth has the normal phenotype?
Not necessarily, no. First of all, when humans breed, there are different genotypic offspring. Huttington's is dominant, but if you have 2 parents who dont have it and they cross, then ofcourse their offspring wont have it. Not everyone is a carrier so no, 3/4 population would not have it
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