If a sperm cell does penetrate the egg after ovulation, fertilization has occurred and a new life has been created. Fertilization usually occurs within the mother's fallopian tube - a structure in-between the ovary and uterus (womb).
When the father's sperm cell fertilizes the egg, other sperm cells are immediately prevented from penetrating the egg by a change in the outer protein coat of the ovum. At the moment of fertilization, or conception, much of your child's make-up will be decided. The coloring of hair, skin and eyes, the sex of your baby, and factors influencing height and build, are all determined at fertilization by information on the genetic material or DNA.
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