Difference between pendulum clock and quartz watch.. plz give photo

A pendulum clock is a mechanical device. It relies on a pendulum swinging at a steady pace, with energy to the pendulum provided by a spring. ... A quartz clock relies on the exactly repeating vibration of a thin sliver of quartz. This vibration creates an electrical current that controls the electronic display.

Explanation:

heres some photos

you know they are heterozygous for a trait because they have it as jj or jj.