Reproductive cells, also known as gametes, are specialized cells involved in sexual reproduction. In humans and many other organisms, there are two types of gametes: sperm and eggs. Sperm are produced in the male reproductive system, while eggs are produced in the female reproductive system. These cells carry half the genetic information needed to create a new individual. When a sperm fertilizes an egg, they combine their genetic material to form a zygote, which then develops into an embryo. This process is essential for the continuation of species and contributes to genetic diversity, as each gamete contains a unique combination of genes from its parent, influenced by processes like meiosis.