Question

Explain the process of fertilization in human beings.

Answer 1

Human fertilization is the union of ahuman egg and sperm, usually occurring in the ampulla of the fallopian tube. The result of this union is the production of a zygote cell, orfertilized egg, initiating prenatal development. ... The process of fertilization involves a sperm fusing with an ovum.


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Answer 2

Explanation:

Fertilisation refers to the fusion of haploid male and female gametes to form a diploid zygote.Fertilisation occurs in the proximal region of the fallopian tube in humans. The process of fertilization involves the following steps:

• During copulation a male releases about 3.5 ml of seminal fluid that contain 200-300 million sperms into the vagina of the  female by the process of ejaculation.
• These sperm start travelling towards the fallopian tubule. Only few sperms successfully travel through the acidic environment of the uterus.
• The ovum again thins out the number of sperms by the fertilizin -antifertilizin reaction.
• As soon as a sperm reaches the secondary oocytes , its acrosome attaches to the egg envelope and releases lysin that dissolves the layers surrounding the oocyte.
• after the sperm successfully penetrates the oocyte, cortical granules begin to appear in the egg cortex and forms a previtteline space. deposition of cortical granules in the previtelline space makes it impervious to any other sperm and prevents polyspermy.
• The entry of the sperm stimulates the secondary oocyte to complete the meiotic division and produce the mature ovum and second polar body.
• Then the sperm nucleus takes the copulation path and  the nuclear membrane of both the male and female nuclei degenerate so that the chromosome can lie side by side.
• Then these chromosome mix up due to amphimixis and result in the formation of zygote.