Huntington’s disease is caused by a single dominant allele. It is a lethal disease, yet it persists in the human population. Which of the following statements best describes why?

A technique used to amplify a desired piece of DNA is

_________ is a human hereditary disease that is caused by a dominant allele but does not typically show its increasingly negative effects in affected individuals until they are middle-aged.

If a mother has type AB blood, and her son has type AB blood, what are the possible blood types for the father?

As the two strands of DNA are unraveled, which enzyme relieves the strain on the two strands that could otherwise lead to supercoiling?

During S phase of the cell cycle:

A gene that codes for a protein was removed from a eukaryotic cell and inserted into a prokaryotic cell. Although the gene was successfully transcribed and translated, it produced a different protein than it produced in the eukaryotic cell. What is the most likely explanation?

The lactose operon is most likely to be transcribed when

During _______, RNA polymerase synthesizes a molecule of RNA using DNA as a template.

The consequence of nondisjunction in chromosome 21 in humans is ___.