Why is the dwarf gene not used to sex identification of chicks?

A、thedwisnotasex-linkedgene;
B、Thedwreducesbodyweightofchicks;
C、itisdifficulttomeasurephenotypeofchickswiththedwgene;
D、thereisnodifferencebetweenmaleandfemalechickswiththedwgene