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A cell in an ovary which may undergo meiotic division to form an ovum -
Sperm cells swim to and fertilize a female reproductive cell called an oocyte, or egg -
An egg is fertilized by injecting a single sperm into the egg or mixing the egg with sperm in a petri dish -
After 30 hours or so, it divides from one cell into two. Some 15 hours later, the two cells divide to become four -
Cells divided -
The development of the heart begins as early as the third week of gestation with the 4-chamber fetal heart formed by gestational week 7 -
The arms and hands start developing
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Embryos heart is beating twice as fast as the mothers -
Gender may be able to development -
The fine hair called lanugo that has covered his tiny body over the past few weeks starts to disappear