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How do humans multiply?
Humans multiply by sexual intercourse. This is when the penis enter the vagina, injecting the sperm at a certain point. The sperm then finds a fertilized egg, entering it. There is basically no certain number of sperms that will enter one egg, nor a certain number of sperm that will enter more than one egg at a time, for that is how twins are made.
What happen 2 sperm had entered the egg?
An egg only allows one sperm to enter and is fertilized by that one sperm: 2 cannot enter.
How quickly does a barrier form around the egg when it meets the sperm?
It's instantaneous. As soon as one sperm penetrates the egg's outer membrane, it's composition changes, preventing more sperm from entering. However - it is possible for two sperm to enter simultaneously - creating non-genetic twins.
What is the diffence between identical twins and fraternal twins?
Identical twins come from one egg and one sperm. Fraternal twins come from two eggs and two sperm.
When a sperm meets egg can another sperm meet with the egg?
Yes, and this is one of the ways that you can get twins. The other of course is that the egg divides before the beginning of Mitosis.
What happens to a sperm that does not enter the egg?
It will die!
Identical twins happen when the two eggs are fertilised?
No. They have to come from the same egg and sperm to have the same DNA (and be identical). Fraternal twins are non identical twins and come from two separate eggs.
How sperm unite the egg?
The sperm create an enzyme that eats away at the outer layer of the membrane of the egg allowing it to enter. The sperm then enters the egg and attaches its self.
Usually one egg is fertilized by one sperm?
because a "wall" is put up when the sperm meets the egg. This prevents another sperm from meeting the egg.
What is the female egg cell function?
the sperm goes to it when having(after) sex(it takes time for the sperm to actually enter the egg.)
Can sperm enter an egg and not make a baby?
Yes, if the egg does not implant in the uterine lining.
Can sprem enter the uterus without fertiling an egg?
Yes, sperm can enter the uterus without fertilizing the egg. Just because a woman is fertile doesn't mean she will fall pregnant, there are a LOT of things that can go wrong to prevent pregnancy such as poor sperm quality or there not being enough sperm reaching the egg to fertilize it.
