Answer:
By eating things with protein in it. Sorry if this sounds too simple, but that's all it is.
point, shift deletion, UV rays, radiations, genetics mutations, gene editing
That is just some method that gene can change within the DNA
There will be 0 sister chromatids would that cell contain during G1 of the cell cycle. Chromatids in biology is defined as each of the two threadlike strands into which a chromosome divides longitudinally during cell division. Each contains a double helix of DNA. The answer in this question is zero (0).