Is the chromosome number of the zygote,embryonal cells,and adult of a particular organism always constant? How is the constancy maintained in these three stages?

(N/A) Yes,the chromosome number remains constant in the zygote,embryonal cells,and the adult of a particular organism.
This constancy is maintained because all these cells are formed through mitotic cell division.
In mitosis,the parent cell divides to produce two daughter cells that have the same number of chromosomes as the parent cell,ensuring genetic stability across these developmental stages.