1. Darwin maintained that among living species, there is no such thing as a higher (more evolved) or

1. Darwin maintained that
among living species, there is no such thing as a higher (more evolved) or
lower (less evolved) animal or plant. Explain what he meant.

2. What is the difference between genetic variation,
environmental variation, and genotype-by environment interaction? Give examples
of each. Try to think of potential examples not covered in this chapter.

3. We noted on the first page of the chapter that humans vary
considerably in height. State a hypothesis about whether this reflects genetic
variation, environmental variation, or genotype-by-environment interaction (any

1. Darwin maintained that
among living species, there is no such thing as a higher (more evolved) or
lower (less evolved) animal or plant. Explain what he meant.

2. What is the difference between genetic variation,
environmental variation, and genotype-by environment interaction? Give examples
of each. Try to think of potential examples not covered in this chapter.

3. We noted on the first page of the chapter that humans vary
considerably in height. State a hypothesis about whether this reflects genetic
variation, environmental variation, or genotype-by-environment interaction (any
hypothesis is okay). What kinds of evidence might settle the question? Are
there experiments that, at least in principle, would decide the matter? Would
it be easier to do them with another species, such as mice?

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