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Reproduction

Reproduction [tab name=”DNA”]DNA Molecule [/tab][tab name=”Chromosomes”]Sex Chromosomes Male embryos usually have an X and a Y chromosome in every cell, whereas females have two Xs in every cell. When a human egg (from the mother) is fertilized by a sperm (from the father), together they form an embryo. The egg and sperm cells each contain Continue Reading...

Reproductive System

REPRODUCTIVE SYSTEMS: Cell Fertilisation – Interactive Female Reproductive Systems – Presentation Male Reproductive Sytstems – Presentation Puberty – Presentation Menstral Cycles – Presentation Human Fertization – Presentation Preganancy – Presentation Birth – Presentation (1444) Page Views...