Huntington's disease, an autosomal dominant disorder, is expressed only with a homozygous phenotype. a. true b. false

B. False

Being autosomal "dominant" means that only one copy of the dominant allele need be present to cause the disorder.
So if H is the dominant Huntington allele, and h is normal, HH (homozygous dominant) or Hh (heterozygous) will lead to Huntington. Only homozygous recessive will be free from the disorder, or normal (hh).

$100. 125 x 0.20 = 25125 - 25 = $100