Question 3
Seven of the eight common human characteristics in this skill come in two sharply different forms. Which one does not?
The right answer is the one marked above.
Skin colour. It runs through a continuous range with no line down the middle, because several characteristics act together to produce it. The other three are either / or.
This matters for the rest of the chapter: Mendel got clean ratios precisely because the pea characters he chose were the sharp kind.