because a "wall" is put up when the sperm meets the egg. This prevents another sperm from meeting the egg.
The egg is usually fertilized in the fallopian tube or just before entering the fallopian tube.
one
A woman's body releases an egg from one ovary each month as part of the menstrual cycle. This is to facilitate fertilization by sperm and potential pregnancy. The egg is then either fertilized by sperm or absorbed by the body if not fertilized.
through sperm that is in semen. it only takes one sperm to fertilize an ova (egg). there are millions of sperm in semen during ejaculation. when a sperm and egg meet and combine successfully, fertilization occurs. (in mammals this successful combination produces an embryo.)
Only one sperm cell can fertilise each ovum. After that no more can get in.
An egg only allows one sperm to enter and is fertilized by that one sperm: 2 cannot enter.
one
To create an embryo ONE egg and ONE sperm must meet. Males usually produce millions of sperm Females usually produce just a small number of eggs (depends on the animal) Once a sperm has fertilized the egg all the rest of the sperm are prevented from entering the newly created embryo.
Zygote
The sperm has to fertilise the egg. sometimes one gets through, others they don't. Obviously if the sperm gets through then the woman is pregnant
If conditions are right that is if she has ovualted and an egg is there to be fertilized
The egg is usually fertilized in the fallopian tube or just before entering the fallopian tube.
One sperm fertilizes one egg, but before the fertilized egg can become a fetus, the egg splits and becomes two eggs made from the same egg and sperm - therefore becoming two babies.
one
In humans, only one sperm can fertilize an egg to form a zygote. If more than one sperm were able to fertilize an egg, it would result in an abnormal number of chromosomes in the zygote, leading to developmental issues and likely miscarriage. This phenomenon is known as polyspermy and is usually prevented by mechanisms in the egg that block additional sperm from entering once one has already fertilized it.
During fertilization, the egg releases chemicals that prevent other sperm from entering once one sperm has successfully fertilized it. This process is called the zona reaction, which helps ensure that only one sperm can fertilize the egg.
a zygote is a fertilized egg. one that has formed by the fusion of an egg cell and a sperm cell