(Contd from yesterday)
Millions of sperms enter the female genital tract following intercourse. Of these only few reach the egg and only one is going to fertilise the egg. There must be a minimum number of sperms in adequate concentration to achieve this. Also only the sperms motile enough will be able to get anywhere near the egg. Moreover no defective sperm will be able to fertilise the egg and in the event it does, it’s unlikely that the pregnancy will continue.
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