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Since the eighties the researches are done in order to determine the gender of the baby, which is determined by the type of chromosome in that particular sperm (X-Chromosome) or (Y-Chromosome). This method depends on the molecular Weight of the sperm; researchers found that the y-sperm has a low molecular weight, so it is faster in movement but lives shorter.

At the same time the oocyte only contains X-Chromosome so when fertilization occurs between an x-sperm and an oocyte, the embryo will be a female (xx), while if a Y sperm meets the oocyte then the embryo will be a male (xy). On the other hand, the x-sperm has a heavier weight then slower motion, but lives longer.

Over decades, the parents were fascinated in determining the sex of their baby according to biological and inherited beliefs, which depend on the human needs.

Sometimes a medical situation where there is a disease linked to either the male or female genes.

Greeks were convinced that the (y) sperm is located in the right testis and the x-sperm in the left testis, so Greek men tied their left testis to prevent female’s embryos, but the Indian man held his left testis tightly during intercourse for the same reason. So, we can calculate the time of ovulation and determine the time of intercourse according to the desired sex.

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