Macromolecules that are used by all organisms to store hereditary information are called:

"do a testcross with a homozygous recessive plant."

there's the proffessional site that will you.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.