What is the map distance between two genes if 90% of the
meioticcells have no crossover in the region between them, 6
percent haveone, 3 percent have two, and 1 percent has three?

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.

b . streams flow into shallow areas.

f . movement of earth’s crust creates low areas that fill with water.