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  • Finding a Y chromosome isn't that helpful where performance is concerned as it isn't just XY and XX out there and some chromosomal abnormalities can mean you are less susceptible to testosterone which can impact development.

    There are people with genetically high red blood cell counts or lung capacity. Usain Bolt has a much higher percentage of fast-twitch muscle fibres (top sprinters tend to be 80-90% compared to the average of 50%). Are we going to test for those too?

    Human biology is complicated and the more we know the less black and white it becomes. A crude genetic test isn't going to help with this.

86 comments