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Two ways-
Sometimes the mother releases two eggs instead of one. Each egg would be fertilized by a different sperm cell, and would grow into two different babies- known as fraternal or non-identical twins.
The second way is one egg, fertilized by one sperm- but as the egg begins to grow, it divides in two, each of which will become a baby- and they are identical to each other (they started life as the same being).
What else can I help you with?
What is the advantage of producing more sperm than eggs?
More baby.. Twins
Why can fraternal twins de different sexes while identical twins cannot?
To keep it simple and not get too technical, fraternal twins are from two eggs and two sperm that independently combine to produce a baby. Identical twins come from a single egg and sperm that divide to create two separate children. Gender is controlled by the males sperm and whether it contains the male genetic X chromosome. Since identical twins have the same sperm their genetic makeup is exactly the same (same egg and sperm used in development). Fraternal twins have two separate sperm and therefore it is possible one has the X chromosome and other does not.
How yo you make baby?
Let the sperm go through the ovum. This is how baby made.
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.
How is a bady is made?
well a baby is made by your moms egg and your dads sperm. first they have to have sex so the sperm and egg can meet. then when the sperm touches the egg it starts to from into a baby. then the baby keeps growing until your mom couldn't hold you in her belly anymore.
Is it the sperm or egg that determines twins?
Sperm contains either an X(female) chromosome or a Y(male) chromosome, whereas the egg contains only an X(female) chromosome. Neither the egg nor the sperm can be said to have a"sex." The combination of an X-bearing sperm with the (X-bearing) egg produces a female baby. The combination of a Y-bearing sperm with the (X-bearing) egg produces a male baby. It might seem that the man (sperm) that determines the sex of the baby, but this assumes that the egg is passive, accepting the first sperm to arrive at the egg. Some recent evidence indicates that this is not so. See the Wikipedia article on "Maternal influence on sex determination.
Where are cells that make a baby produced?
The egg cell is made in the ovaries(women) and sperm in made in the testicles.
Do twins have two placentas?
Yes, twins can have two placentas, one for each baby. This is more common in fraternal twins, who develop from two separate eggs fertilized by two different sperm. Identical twins, who develop from a single fertilized egg that splits into two embryos, can sometimes share a single placenta.
What did women do if they do not release sperm?
A women is not capable of releasing sperm. Women release eggs. Only a male (man) can release sperm from their body. When sperm and a fertilized egg combine, a baby is made.
Do identical twins develop from two different eggs that are fertilized by different sperm?
No, fraternal twins do.
Can fraternal twins have two sperm donors?
yes
Does a male sperm decide twins?
No, the male sperm does not determine whether twins are conceived. The occurrence of twins is primarily dependent on the female's ovulation process: fraternal twins result from the release of multiple eggs during ovulation, while identical twins arise from the splitting of a single fertilized egg. Factors such as genetics, maternal age, and certain fertility treatments can influence the likelihood of having twins, but the sperm itself does not decide this outcome.
