A fetus can now be screened for some of the more common genetic diseases and its sex determined from just a whole blood sample from the pregnant mother. Fetal DNA is abundant enough in the systemic circuit to be able to be purified and sequences analyzed. Question is, in the case of fraternal twins, could the procedure discern between the two fetus's...
As a clearer example, can it distinguish between:
Scenario 1: if one fetus was male and one fetus female And scenario 2: both male?
It appears the test would just look for presence of Y chromosome using certain markers. But it could then look at SNP to distinguish individuals.
Looking for clarification here