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A certain couple
The two chromosomes that determine the sex of the unborn baby are called sex chromosomes named X chromosomes and Y chromosomes. A female has two chromosomes, while a male has one X and one Y chromosome. The gametes (egg and sperm) have only one set of chromosomes. Thus, in females all the egg cells contain X chromosomes while in males, half sperm have X chromosomes and half sperms have Y chromosomes.
The sex of the child depends upon the kind of sperm that fertilizes the egg. It is simply a matter of chance as to which category of sperm fuses with the ovum. If a couple has only daughter, this means that every time X-bearing sperm of father fertilizes the egg of female. Therefore, it doesn’t mean that the male (husband) does not produce Y-bearing sperms.
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