How are twins (boy and girl) formed?#shorts
0:39
YouTubeHealth Manager
How are twins (boy and girl) formed?#shorts
Twins, one male and one female (fraternal twins), are always fraternal twins, formed by the union of two separate eggs with two separate sperm. One fertilized egg has an XY sex chromosome combination (developing into a boy), while the other has XX (developing into a girl). Therefore, their sex determination mechanism is exactly the same as that ...
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