The Process of Fertilization

The Process of Fertilization

Reproduction is the process by which a living organism produces its own kind. In humans, the first step in reproduction is called fertilization. It takes place when the sperm cell and the egg cell unite.

Fertilized Egg

Fertilization takes place in the fallopian tube. The fertilized egg is called a zygote. After 4 weeks the zygote is called an embryo. On the third month the unborn is called fetus. At this period the organs and the tissue are already formed. The fetus stays in the uterus for 266 days or 38 weeks before it is formed.

Chromosomes

The fertilized egg called zygote contains 46 chromosomes – 23 from the father’s sperm and 23 from the mother’s egg cell. The chromosomes are the carriers of the genes which are the determiners of hereditary characteristics include the color of the eyes, the texture of the hair, height and even intelligence.

Placenta

The zygote which after four weeks is called an embryo stays in the uterus. A special organ called the placenta develops near the embryo. Through the placenta, the embryo absorbs oxygen and food nutrients needed for its development.

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