A zygote is formed when a male gamete (sperm) fertilises a female gamete (egg). Fertilisation is the process through which the male and female gametes, both haploid cells containing 23 chromosomes, fuse their chromosome to form a single diploid cell, containing 46 chromosomes. This diploid cell is known as the zygote and can go on to form a pregnancy. If pregnancy is established, the zygote grows into an embryo and eventually a foetus, as the pregnancy develops.
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