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Hum Reprod. 1999 Nov;14(11):2917-20.

Human live birth and sperm-sex ratios compared.

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  • 1University Pompeu Fabra, Department of Economics, Barcelona, Spain and Genetics & IVF Institute, 3020 Javier Road, Fairfax, VA 22031, USA.

Abstract

The human secondary sex ratio is compared with the percentage of Y-chromosome bearing spermatozoa in human semen. Live birth sex ratio is about 51.3%, whereas the overall percentage of Y-chromosome bearing spermatozoa in our study samples was 50.3%, i.e. 1% closer to the proportion expected by Mendelian segregation. The observed difference between live birth and sperm-sex ratios was significant (P < 0.0001). A possible effect of male age on the percentage Y-bearing spermatozoa was found to be non-significant.

PMID:
10548648
[PubMed - indexed for MEDLINE]
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