Can someone please explain to me the biological definition of what alternative hypotheses is? I've looked through the paragraphs in my textbook, however, I still can't seem to arrive at a clear understanding of what the definition is.

Answer 1

Here are some examples:
Whatever A and B designate, if your original hypothesis is A=B, then the alternative is A≠B.
If the original hypothesis is A effects B, then the alternative is A does not effect B.