The chromosomal combination of the human male is XY. Therefore, in the advent of the need of a male child; the father who has an XY chromosome must donate only the Y chromosome and it will fuse with the X chromosome of the mother who possesses an XX chromosome.
Definitely, women must have aware of their time of their menstrual flow (passage of blood) which is their seeing period and their none seeing period; characterized by the termination of the flow. The classical menstrual cycle last for 21 days, from the start of one cycle to the beginning of another.
The seeing period normally last for 7 days. Afterwards, there are 18 days left in the cycle. This 18 days are the fertilization period for the making of babies because of the ovulation of the woman. Therefore careful methods when making love at the safe and unsafe periods can result into a male embryo. For more about this “Methods” you must Click Here! for invaluable information
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