In contrast, each egg cell, or ovum, is relatively large and non-motile. During fertilization, a spermatozoon and ovum unite to form a new diploid organism.

Haploid gametes contain 23 single chromosomes. copies of the genetic information are made the cell divides twice to form four gametes, each with a single set of chromosomes (haploid) all gametes ...

Mature ova are released from the ovary into the oviduct where they may be fertilised by sperm to form a zygote. In humans, fertilisation happens inside the woman’s body. This is a process called ...