LEARN HOW FERTILIZATION AND EMBRYONIC DEVELOPMENT OCCUR - PREGNANCY
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How Fertilization Works



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Human fertilization occurs when a sperm enters the egg, which usually sits on the first portion of the fallopian tube, making the woman pregnant. A single sperm crosses its membrane, carrying 23 unpaired chromosomes. Immediately, these isolated chromosomes combine with the other 23 chromosomes that exist in the ovule, happening to form a normal complement of 46 chromosomes, arranged in 23 pairs