chromosome

Researchers suspected that the mutation causing the condition was somewhere on the X chromosome, because females, which have two X chromosomes, are less affected.

At her 10-week appointment, she learned that her child had triploidy, a genetic condition where a fetus has three sets of chromosomes instead of two, and would miscarry late-term or die at birth.

However, this egg is not ready to be fertilised by sperm as it already contains a full suite of chromosomes.

People with this particular DSD have male XY chromosomes, but some are recorded as female at birth.

Whether you like Harris or not, a possible run by the XX chromosome former vice president raises a perennial conundrum: Can a woman win the presidency?