0
Once the first sperm penetrates the egg, a series of changes take place in the protective layers around the outside of the main part of the egg (oocyte). This process, called the cortical reaction, makes the layers hard and not able to be penetrated by any other sperm.
When the sperm's plasma membrane fuses with the egg's plasma membrane, there is a depolarisation of the egg's plasma membrane caused by an influx of sodium ions into the cell. This acts as a temperary barrier (several minutes) to other sperm until the outer vitiline layer of the egg becomes solid!!
What else can I help you with?
Why does a membrane enclose an egg once a sperm has entered?
It prevents secondary fertilization by another sperm cell.
What is the human male gamete called?
The male gamete is a sperm. The female gamete is an ova or egg.
In internal fertilisation how many sperm cells and egg cells are wasted?
50 million sperm are discharged during just one ejaculation in a normal healthy male normally there is only one ovum released in the woman so in this case if the ovum is fertilised no egg cells are wasted and 49,999,999 sperm are wasted.
Which cell decides the sex of the baby the sperm cell or the egg cell?
Genetically, the contributions of the two parents are almost identical.Both the sperm and the ovum contribute the same amount of genetic information on nuclear chromosomes. They each contribute a haploid number of chromosomes (i.e. one set of 23 chromosomes).However, a few genes (37) are carried on the mitochondrial DNA (mtDNA), of which there are hundreds of copies in a typical cell. All the baby's mtDNA comes from Mum; Dad supplies only nuclear DNA. So the mother contributes a few more genes to the child than the father does.
How does the ovum prevent multiple penetrations of sperm cells along it's periphery?
The ovum has a protective layer called the zona pellucida that hardens after the entry of one sperm cell, preventing additional sperm cells from penetrating. This process is known as the zona reaction and ensures only one sperm cell fertilizes the egg.
Is it possible for another man's sperm to overpower the sperm of the biological father so the baby resembles the other man?
No. Only the sperm that fertilizes the egg will share its genetic information with the fetus.No. Only the sperm that fertilizes the egg will share its genetic information with the fetus.No. Only the sperm that fertilizes the egg will share its genetic information with the fetus.No. Only the sperm that fertilizes the egg will share its genetic information with the fetus.
How many sperm fertilizes the egg?
There are lot of sperm cells i a male's body but only 1 can fertilize it. :)
Is It the secondary oocyte and not the egg that the sperm fertilizes?
Yes, it is the secondary oocyte that the sperm fertilizes. The secondary oocyte completes meiosis II to become a mature egg only after fertilization.
What sperm cells are released from the male and are implanted in the female?
Only one sperm cell fertilizes the female egg during sexual reproduction. The sperm cell contains genetic material from the male that combines with genetic material from the female to form a new individual.
Is sperm a form of bacteria?
Sperm Is Not BacteriaNo. Sperm is something that fertilizes the egg that's released into the fallopian tube. Only one sperm will fertilize the egg, other will eventually die. During fertilization the sperm loses it's tail and the cell in the egg begins to divide and turn into a baby.
Why does a membrane enclose an egg once a sperm has entered?
It prevents secondary fertilization by another sperm cell.
How much sparms are required for reproduce a baby?
Only one is needed.During an ejaculation, the male releases millions of sperm into the woman. However, by the time they are close to the region of the oviduct where they meet the egg to fertilize it, only a few of these sperm remain. It's a case of survival of the fittest, whereby only the strongest sperm (only one) gets to fertilize the egg.
Method of reproduction of a chicken?
The female chicken lays eggs. the male chicken's sperm cell fertilizes the female chicken's egg cell from the eggs. the sperm cell is thousands. all of them are trying to fertilize one egg cell. But only one sperm cell can be successful.
If and x sperm fertilizes will the offspring be male or female?
An offspring will only be male if it has a Y chromosome.
What is the human male gamete called?
The male gamete is a sperm. The female gamete is an ova or egg.
Is zygote produced by meiosis?
The two gametes (sperm and egg) are produced through meiosis. The zygote is formed only when the sperm fertilizes the egg.
In internal fertilisation how many sperm cells and egg cells are wasted?
50 million sperm are discharged during just one ejaculation in a normal healthy male normally there is only one ovum released in the woman so in this case if the ovum is fertilised no egg cells are wasted and 49,999,999 sperm are wasted.
