When the diploid number of chromosomes in a given cell is 20, the normal number of chromosomes found in bone cell of this fish Is also 20.
When we refer to chromosome numbers as being diploid, what we mean it's that each cell has two copies of each chromosome. These are known as homogamous chromosomes because they contain similar information.
For most eukaryotic cells and organisms, chromosomes are found in diploid pairs. This layout of diploid chromosomes is essential for the process of cellular multiplication. Therefore, the normal situation if for all cells to contain diploid numbers, so when the question states that one cell has 20, we can infer that all cells have 20 diploid chromosomes.
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