Piecing It Together on p. 78 of the text describes the six major concluding principles

Mendel hypothesized from his work. Describe three of them.

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Mendel principles

Now a comment on your text. Mendel had two major principles, which we know now as the law of independent assortment, and the law of segregation. I have seen those divided up into three, or four conclusions, but never six. So you are getting your money's worth with that text.