instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: Wavelength is one way of measuring the size of waves. It is the distance between two corresponding points on adjacent waves, and it is usually measured in meters. How it is measured is a little different for transverse and longitudinal waves. Answer: waves
answer:
What do wavelengths measure the size of?

question:
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
answer:
What factors determine the effect of a gene?

question:
Passage: A front forms at the boundary between two air masses. Types of fronts include cold, warm, occluded, and stationary fronts. Clouds, precipitation, and storms commonly occur along fronts. Answer: a front
answer:
What forms at the boundary between two air masses?