Given a scientific passage and an answer, generate a question for the given answer.

[Q]: Passage: For example, remember that for the height gene in pea plants there are two possible factors. These factors are alleles. There is a dominant allele for tallness (T) and a recessive allele for shortness (t) . Answer: alleles
[A]: What factors determine the effect of a gene?

[Q]: Passage: Landslides are the most dramatic, sudden, and dangerous types of mass wasting. Landslides are sudden falls of rock; by contrast, avalanches are sudden falls of snow. Answer: landslides
[A]: What are the most dramatic, sudden, and dangerous types of mass wasting?

[Q]: Passage: The cardiovascular system circulates blood through two different loops. Pulmonary circulation is a loop that carries blood between the heart and lungs. Systemic circulation is a loop that carries blood between the heart and the rest of the body. Answer: pulmonary and systemic
[A]:
What are the two loops of blood flow in the cardiovascular system?