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Pregnancy generally results from a sperm cell traveling through the cervix into the fallopian tube to fertilize an egg cell. There are millions of sperm that are released during intercourse. If a sperm penetrates an egg, then fertilization occurs and a zygote is created, which has 46 chromosomes (23 from the male and 23 from the female), the normal complement for a human somatic cell. This is the basis for a developing person. As the zygote travels through the fallopian tube toward the uterus, the zygote continues to develop by multiplying and growing. This process can occur naturally following male ejaculation during sexual intercourse, or there may be medical intervention, such as artificial insemination or in vitro fertilization. Artificial insemination occurs when sperm is injected ...

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