Somewhere, between identical and fraternal twins lies semi-identical twins.
Identical twins share the same egg and sperm cell. Fraternal twins don't share the same egg or sperm cell but rather are born at the same time. Semi-fraternal twins share the same egg cell but a different sperm cell.
Wow, this is so fascinating. I wonder how many people think they are identical or fraternal twins but might be semi-fraternal twins.
Researcher's recently discovered this.
Semi-Fraternal Twins Discovered
Monday, March 26, 2007
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