Conducting a monohybrid cross of F1 generation plants, the recessive trait reappears in F2 plants in a ratio of .

1:1
2:1
3:1
4:1

3:1

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indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.