Here's why:
* Sperm and Egg Cells (Gametes): Each human sperm and egg cell (also known as gametes) contains 23 chromosomes. This is called a haploid number.
* Fertilization: When a sperm and egg fuse during fertilization, their chromosomes combine.
* Diploid Zygote: The resulting zygote now has 46 chromosomes (23 from the sperm + 23 from the egg). This is called a diploid number.
Therefore, all human cells (except sperm and egg cells) have 46 chromosomes.
