If a cell having 90 chromosomes underwent mitosis, how many chromosomes would be there in the resultant cells?
Mitosis produces cells that are genetically identical to the original cell. So the number of chromosomes will stay the same. If a cell having 90 chromosomes undergoes mitosis, the resultant cells also have the same number of chromosomes, because mitosis undergoes equational division(nuclear division in which each chromosome divides into equal longitudinal halves), the original number of chromosomes is maintained by a mitotic division.