Here's why:
* Sexual reproduction involves the fusion of two specialized sex cells called gametes (sperm and egg).
* Each gamete carries half of the genetic information (one chromosome from each pair) from the parent organism.
* When these gametes fuse during fertilization, they combine their genetic material, creating a new individual with a unique combination of genes from both parents.
This mixing of genes during sexual reproduction is the primary source of genetic variation within a species.
