When egg is fertilized by a single sperm, a single cell is formed. Can any please tell me how it happens ?

Question

Please do not just tell me about the combination
of chromosomes (egg and sperm). Does a single
cell contain only chromosomes and nothing more?
Please give me a more creative answer.

Answer 1

Not sure exactly what you're looking for but maybe this'll help. The sperm gets rid of most of its cytoplasm, while the egg keeps and enlarges its cytoplasm. So when the sperm membrane fuses with the egg membrane, the sperm nucleus goes in and finds itself with plenty of cytoplasm (including mitochondria, Golgi, etc) and a second nucleus. The two nuclei fuse together. Since the sperm and egg have gone through meiosis and become haploid (have only one set of chromosomes) fusion brings the cell back to being diploid (two sets of chromosomes). The fused cell can now do lots of cell division and produce lots of cells to make all the structures of the body.

Answer 2

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No. Medically speaking an abortion is the termination of a pregnancy. It is not the prevention of one happening. This is the way pro-lifers twist the meaning of terms. Medically a pregnancy doesn't exist until a fertilized egg implants. Plan b works two ways. One is by preventing ovulation or fertilization (by altering tubal transport of sperm and/or ova). Second, it may inhibit implantation by altering the endometrium. Plan B is not effective if a woman is pregnant. Plan B is a contraceptive and cannot terminate an established pregnancy. If you are upset that a fertilized egg consisting of a few divided cells might not implant though you should refrain from taking it. This is not however, medically considered a pregnancy. If you aren't already you should use other means of contraception or birth control on a regular basis. Plan b is meant to be used in cases of emergency where someone forgot, the method failed, rape occurred, or single slip up of some type. Its not a form of regular birth control.

Answer 3

Contact between sperm and egg triggers something called the acrosomal reaction. A single sperm is able to penetrate the outer layer of an egg by releasing enzymes from its head. These enzymes chew through this outer material. Once the sperm chews through the outer layers, the cell membranes of the sperm and egg fuse together. Lastly, the sperm and egg nuclei fuse to form the zygote nucleus, and fertilization is complete. Now the single fertilized egg can begin dividing through cleavage and form an organism.

Answer 4

Egg = It is a single cell with a lot of cytoplasm.
The single nucleus inside has only half the required chromosomes for full development.
for instance , in human , the egg nucleus contains only 23 chromosomes as against required 46. So It is a haploid cell. ( A cell with half the number of chromosomes in its nucleus.)

Sperm= It is a single cell with comparatively a Small amount of cytoplasm which mainly used for motility (movement) towards the egg.
The nucleus is with half the number of chromosomes as in the egg. ( 23 ; haploid)

Fertilization = When the haploid sperm unites with the egg , only the nucleus gains entry and fuses with the egg nucleus , so that the nucleus is one but the chromosome number is doubled ( 46 and diploid)
The cytoplasm of the sperm , having performed its function , is left behind.

So now, the egg cell is still only one, but having a diploid nucleus with a full complement of human chromosomes i.e. 46.

It is now ready for further development and growth in to another human being.

Edit:- A cell is not only chromosomes/nucleus ; it has cytoplasm as well and both together make a viable unit. Very much like brain and body or CPU and the monitor together make a functional unit.

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Answer 5

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RE:
When egg is fertilized by a single sperm, a single cell is formed. Can any please tell me how it happens ?

Answer 6

All mammals rely on internal fertilisation through copulation. To deliver the sperm to the female, the male inserts his sexual organ, the penis, into the opening of the vagina, the passage into the female's other sexual organs. (This process is a part of copulation.) Once the male ejaculates, a large number of sperm cells swim toward the ovum.

The capacitated spermatozoon and the oocyte meet and interact in the ampulla of the fallopian tube. In mammals, binding of the spermatozoon to the zona pellucida, an extracellular layer surrounding the oocyte, initiates the acrosome reaction. This process releases the enzyme hyaluronidase, which digests the matrix of hyaluronic acid in the vestments surrounding the oocyte. Fusion between the sperm and oocyte plasma membranes follows, allowing the entry of the sperm nucleus, mitochondria, centriole and flagellum into the oocyte. Once the ovum fuses with a single sperm cell, its cell membrane changes, preventing fusion with other sperm.This process ultimately leads to the formation of a diploid cell called a zygote.

Answer 7

so many info is given to u
this is possible that 1 sperm fertilize 1 egg
the genetic data of both fuse and give rise to new cell
and these cells do nothing except making zygote the new cell!!

Answer 8

The egg cell only has half of the genes needed for life, and the sperm only has half of the genes needed for life. When they join in fertilization, they combine the genes, so that the organism has the full complement of genes needed for life.

for instance, in humans:
somatic (normal cell), has 46 chromosomes
egg or sperm cell (gamete), has 23 chromosomes each
23 (egg) + 23 (sperm) = 46 (human)

Answer 9

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Answer 10

look up a process called meiosis.... that will explain how eggs and sperm... or "haploid" cells are made, after you understand that process it will make more sense how a egg and a sperm make one cell with the same amount of chromosomes as everyone else, as opposed to having double the amount.