Here's why:
* Haploid: Means having one set of chromosomes (n). This is typical of gametes (sperm and egg).
* Diploid: Means having two sets of chromosomes (2n). This is typical of most body cells in an organism.
* Zygote: Formed by the fusion of a sperm and egg. This means it receives one set of chromosomes from each gamete, resulting in a diploid cell (2n).
Therefore, a zygote has the diploid number of chromosomes.