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?
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Many more generations can be studied using short-lived organisms.
Scientists prefer to study what has previously been studied.
Society does not have ethical issues with lab-kept fruit flies.
Fruit flies are relatively inexpensive.
All these are good reasons.
A short life cycle means that scientists can study expression patterns and gene transmission in many generations in a matter of weeks, instead of years as in many other organisms.
It is also good to study what has been previously studied as this lets scientists build on the work of others and gain perspective on their own studies.
Society does not have *serious* ethical issues with lab kept fruit flies. There are some ethical standards but they are not as high as is the case with, for example, gorillas or other cuter animals.
And fruit flies are inexpensive. In this day and age, inexpensive is good.
I'm sorry that is not more helpful. Do you have any thoughts about which one might be right?