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Professor Allan Pacey, professor of Andrology at the University of Sheffield and former chairman of the British Fertility Society, said: 'To date, the experiments have only been performed on the sperm from laboratory mice and we don't know if this effect would be seen in the sperm from other animals, such as cattle where producing more females is important for dairy herds or Sex dating Shimada humans where would be parents may desire a child of a specific sex although that is currently unlawful in the UK. So that the utmost secrecy is maintained, no one from this agency will have any direct involvement in the execution of your mission. However, Fazeli thinks it may not be necessary to select the fastest or slowest swimmers before insemination or In Vitro Fertilisation IVF to influence the sex of an embryo.

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Evolution of sex determination and the Y chromosome: SRY-related sequences in marsupials. Waterbury JA, Jackson LL, Schedl P Analysis of the doublesex female protein in Drosophila melanogaster : role on sexual differentiation and behavior and dependence on intersex. Upper image: sex ratios of embryos using the sperm incubated in HTF medium.

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