Explain the events taking place at the time of fertilization of an ovum in a human female

Dear student

Please refer the solution below for the said query

• During coitus, the semen is released into the vagina, passes through the cervix of the uterus and reaches the ampullary-isthmic junction of the fallopian tube.
• The ovum is also released into the junction for fertilisation to occur.
• The process of fusion of the sperm and the ovum is known as fertilisation.
• During fertilisation, the sperm induces changes in the zona pellucida and blocks the entry of other sperms. This ensures that only one sperm fertilises an ovum.
• The enzymatic secretions of the acrosomes help the sperm enter the cytoplasm of the ovum.
• This causes the completion of meiotic division of the secondary oocyte, resulting in the formation of a haploid ovum (ootid) and a secondary polar body.
• Then, the haploid sperm nucleus fuses with the haploid nucleus of the ovum to form a diploid zygote.

Hope this information clears your doubt about the topic.

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