Fruit flies are commonly used in genetic investigations that focus on traits passed from parents to offspring over several generations. what can you infer is the reason fruit flies are the most commonly used organism for this type of investigation?

The correct answer will be-short life span and rapid reproductive.

Explanation:

Fruit flies or Drosophila melanogaster is a model organism used to study the principles of genetics as:

1. Short life span- they have a very short life span about 40-50 days in which they complete their life cycle.

2. Reproduction- The reproduction in an organism is very rapid that is they reproduce and produce a large number of offsprings in a short period of time.

Thus, scientist uses them to study genetics and observe traits in a small period of time.