About 23 in every 1000 births are fraternal, a much higher rate than the three or four out of 1000 births for identical twins. Examining each twin’s DNA will reveal whether they are identical or ...

Fraternal twins, on the other hand ... one twin loses a Y chromosome and develops as a female. The female twin would have ...

Therefore, fraternal twins are essentially like typical brothers ... Twins are also more commonly female, rather than male. But male embryos die at a higher rate while in-utero than do female ...