Question R5 Q17 - NSB Round Robin 2013

If Huntington's disease is determined by a dominant allele and is always fatal, then which of the following explains its continued inheritance?

W) Huntington's disease only shows up in a fraction of the individuals who carry the allele

X) There is heterozygote advantage for the alleles that cause the disease in tropical regions

Y) Huntington's disease shows up later in life, typically after the individual has reproduced

Z) Huntington's disease has a cure that allows individuals who have it to not show any symptoms and reproduce

Science Bowl Question