1) Mendel allowed each variety of pea plants to self-pollinate, or self-fertilize, for several generations. This ensured each variety was true-breeding for the trait (which means all offspring will have only one form of the trait). An example: all true-breeding purple pea plan...
Perhaps "all" noun question in a sentence?
"You gonna let him push you around like that, boy?" is rhetorical. Think of it as more of statement than a question.