Would you be surprised to learn that black is the absence of color, and white is all colors? If not, then keep talking about chromosomes, you do so well)))
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I tell you:
(a) The same word may have completely different meanings in different branches of science. The word "hyperbole"

The same phenomenon can be viewed and explained differently from the point of view of different sciences.

For example, any neurophysiologist will tell you that "no" (no) any color, including black, is just a sensation that forms the human brain, decoding signals coming through the nerve pathways from the receptors of the retina. These feelings are individual.

The physicist will tell you about the wavelength for each color, this is only a problem - purple does not have its own wavelength (in fact, he is not alone, but it is not about it now).

The designer of the monitors and the eight-class student, who read the textbook on physics, will voice a point of view close to the above - black - the absence of color, white - all the colors together.

But the artist will say exactly the opposite: black color can be obtained by mixing red and green colors (possibly even blue). And printers in the absence of black ink mix purple, blue and yellow. Getting white by mixing different colors is impossible.

To increase the level of general erudition googlem words "chromosomes" and "pigment".