Eggs are released from the ovaries from follicles. The egg travels through the fallopian tube to the uterus. As the egg is making it's journey, the sperm can fertilize the egg.

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The union of the sperm and egg cause genetic variation. In humans the sperm and egg, each contain 23 chromosomes. The fertilization process starts as there are 100 million sperm and one egg.

Fertilization

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

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