(answers for these questions => only when they are applicable)

Who first introduced (invented) this technique? (a bit history about its discovery)

What is corssing? How does it work? (the mechanism: such as RNAi to block RNA translation)
Selfing is one form of crossing.

Selfing: hermaphrodite self-fertilization


Why is it used (when to use it to produce what consequences? to study what?)?

How is it done? (methodology)

How much time does it take?

Advantage or disadvantage to use such technique in research

An example to illustrate such technique (movies, images and any other resources to accompany the explanation)

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