• A day or two after an ovary releases an egg, the egg may unite with a sperm.
  • Sperm are deposited in the vagina during sexual intercourse.
  • They propel themselves through the uterus and enter a fallopian tube.
  • This is where fertilization usually takes place.
  • When a sperm penetrates the egg, it triggers the egg to complete meiosis.
  • The resulting cell, called a zygote, contains all the chromosomes needed for a new human organism.
  • Half the chromosomes come from the egg and half from the sperm.
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