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The difference is in sine wave generation algorithm.
In HI freq - it is 30kHz signal, modulated by 50Hz.
Sum or difference - so 28.5 or 18.5 KHZ All three frequencies still exist, not just the sum or difference.
In the next generation that trait increases in frequency above the frequency in the current generation.
The sum of proportions computed from a frequency distribution must equal
The frequency of the populations alleles. Their gene frequency must change to have evolution.