Let's look at human chromosomes. This is a photomicrograph of stained human chromosomes from one body cell. How many chromosomes are there? No, count again. No, try again.

The process of sexual reproduction occurs due to the formation and subsequent fusing i. This type of reproduction creates genetic variation in offspring. Sex cells are formed through a process called gametogenesis that occurs during meiosis. Both male and female reproductive cells passes through a Become a Study. Try it risk-free for 30 days. Log in.

In humans, male sex cells or spermatozoa sperm cells , are relatively motile. Female sex cells, called ova or eggs, are non-motile and much larger in comparison to the male gamete. Male and female sex cells are dramatically different from one another in size and shape.

NCBI Bookshelf. The formation of sex cells is a central part of human reproduction: In fertilization, an egg cell and a sperm cell combine. These sex cells are also called reproductive cells or gametes. Sperm cells are produced in men's testicles and egg cells are produced in women's ovaries. Sex cells are different from other cells in one special way: Put simply, they only have one half of the total amount of human genetic information.