All men make equal amounts of X and Y sperm. It's not possible to make more of one or the other, since the process is driven by meiosis.
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All men make equal amounts of X and Y sperm. It's not possible to make more of one or the other, since the process is driven by meiosis.
They can only tell on things that are gender specific AND represented in the chromosomes. Autism, no one really knows if/how that is represented in the genome and you can't test for that (and BTW it's not gender specific either, girls can have autism and it is not a guarantee to have a girl.) Down's is not gender specific, both boys and girls can have it.
jilli, I did just want to mention that to the best of our knowledge men DO make 50-50 X and Y sperm. It is possible but not proven or understood that perhaps in some couples, those go onto produce different gender ratios of offspring but we just do not know how this occurs. I have seen some gals with terrible gender splits in one cycle go onto have the exact opposite results in different cycles and end up with great splits. Good luck!