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The stark and unpalatable truth of the matter is that gender selection has been going on for millennia, often in the most brutal fashion and for barely rational reasons. It still occurs regardless of rarefied debates on ethics.

I subscribe to the secular, Western take on this issue. One gender or another should not be regarded as a disease, nor in a right-thinking society be regarded as a social or economic millstone for parents. Advances in genetic science should not be used to indulge the vanity of parents who want to pre-order linebackers or ballerinas; nor should they be a pretext for certain religious communities to air their ancient prejudices.

The raw science isn't at fault, it's just that the application is problematic. If we're given the means to eradicate genetic diseases that cause suffering and impair quality of life, we should use them. Perhaps if technology and resources one day permit it, the hit-list of diseases should include eczema and myopia as well as cystic fibrosis and muscular dystrophy. But does it then follow that poor hand-eye coordination or a probable lifespan below 90 are genetic defects to be repaired? What if functional immortality is one day possible? Would we be tempted to accept sterility and cultural atrophy to dodge the reaper? Should governments try to engineer equal numbers of men and women in the interests of contentment?

It is far too easy for this debate to drift into the lofty terrain where genetic science mutates into science fiction. Germline gene therapy, whereby DNA is repaired before replication, remains theoretical. Somatic gene therapy, the repair of genetic disease in isolation with no prospect of propagating a corrected version, is still an experimental area. The crude truth is that genetic science can typically only cure a disease by identifying its probable occurrence, thereby allowing parents to avoid or terminate a conception.

In this way, a clinical argument can arise for certain parents to choose a gender. For example, Haemophilia is a recessive disorder linked to the X-chromosome. Women carry the disorder but have another X-chromosome to mask it. The Y-chromosome however cannot mask the defect so even though a male child can't propagate the disease, they are likely to manifest it. If the means were available, a medical practitioner would have to advise a female carrier against having a male child if at all possible.

Yet even here, there is danger. Widely available genetic screening and awareness of its

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