When two cells with *n* number of chromosomes fuse, the resulting cell is called a zygote and will have 2n number of chromosomes.

Here's why:

* n represents the haploid number of chromosomes, meaning the cell has one set of chromosomes.

* When two haploid cells fuse (like a sperm and egg), they combine their genetic material.

* This results in a cell with two sets of chromosomes, hence 2n, which is the diploid number.

The zygote is the first cell of a new organism and will continue to divide and develop, maintaining this diploid number of chromosomes in most of its cells.