3 ms·
Very rare cases. And they still usually fall into male and female - XXY chromosomes are male for example.
by collyw 7y ago
Very rare cases. And they still usually fall into male and female - XXY chromosomes are male for example.
- dragonwriter 7y agoEven XY chromosomes aren't invariably male (they aren't even “invariably male or infertile female”, as was believed until fairly recently.)