Abstract
Human spermatozoa pass a torturous journey during fertilization. A slight deviation from 1:1 has been observed in the sex ratio and a number of variables ranging from seasonal, religious days and position of females during mating have been implicated in producing offsprings of a desired gender. The selective choice of sperm by a female based on the aforementioned factors [superstitions] has not been substantiated. In this investigation we collected data from 2,071 pregnant women who visited our two laboratories for genetic amniocentesis during the past two decades. The findings are classified by age group:
The sex ratio remains the same for all age groups except the group of women in the range of 20-24 years. This finding is apparently fortuitous because of the smaller sample size. The concept of sex determination based on a non-chromosomal [X- or Y-chromosome] basis will remain an enigma in the mind of religious orthodoxies as even older eggs did not have any preferential attraction for either X- or Y-chromosome bearing sperm.
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Verma, R., Shklovskaya, T. & Baheig, S. Do X- or Y-chromosome bearing spermatozoa competes with older eggs in human?. Genet Med 2, 113 (2000). https://doi.org/10.1097/00125817-200001000-00226
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DOI: https://doi.org/10.1097/00125817-200001000-00226