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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.
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Why are twins formed in one embryo?
Twins are formed when a fertilized egg divides into two embryos early in development. These embryos can develop into identical twins if they split before any differentiation occurs. Fraternal twins occur when two eggs are fertilized by two separate sperm, leading to separate embryos.
Why are some twins identical and some not?
The reason why some twins are identical and some are not starts in utero. Identical twins occur when one egg is fertilized and it splits to create two embryos. Nonidentical twins come from different fertilized eggs.
If a boy and a girl are twins are they faternal twins or twins?
If a boy and a girl are twins, they are known as fraternal twins. Fraternal twins result from the fertilization of two separate eggs by two separate sperm cells, whereas identical twins result from the fertilization of a single egg by a single sperm cell that later splits into two embryos.
Does the father determine the gender of the child"?
No, the father's sperm carries either an X or Y chromosome, but it is the mother's egg that ultimately determines the gender of the child. If the egg is fertilized by a sperm with an X chromosome, the child will be female, and if it is fertilized by a sperm with a Y chromosome, the child will be male.
Can twins be two different races?
Yes, it is possible for twins to be different races if each parent is of a different race. This can occur when each parent contributes different genetic traits to the offspring, resulting in twins with varying physical characteristics.
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.
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.
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.
Which gamete determines the gender of the offspring in homosapians?
The sperm gamete determines the gender of the offspring in humans. Sperm carries either an X or a Y sex chromosome, while the egg always contains an X chromosome. If a sperm with an X chromosome fertilizes the egg, the offspring will be female (XX). If a sperm with a Y chromosome fertilizes the egg, the offspring will be male (XY).
How are identical twins genetically from fraternal twins?
Identical twins are genetically the same, because they come from the same fertilized egg/sperm cell zygote, which happens to split into two viable zygotes. Fraternal twins, however, come from two different egg/sperm cell zygotes, that are concurrently fertilized and remain viable.
How are identical twins created?
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.
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 many egg cells are used with twins?
It depends on the type of twins If It was identical (monozygotic) twins, one egg is fertilized (As you can see, identical twins have similarity in phenotype (the observable characteristic of an organism) because of development of one zygote divided into two embryos) but if it was non-identical twins, two eggs or more (such as triplets or quadruplets) are fertilized. The twins have differences in phenotype
How do you know if you have a girl or a boy?
It depends on women's egg. Women have a egg which is a child. Peroids are eggs, eggs can die if not fertilized, periods drain the egg away. Women grow a egg each month. The egg needs sperm to fertilize to grow into a child. The men's penus touches the women's vagina and the sperm swims into the women's body to find a egg. Only one sperm can get into the egg. The men's sperm decides what gender the baby is. Women's eggs is x. Men's sperm is y and x. If egg x and sperm y touch, it's a boy, if egg x and sperm x touch, it's a girl. If a sperm gets into a egg and the egg breaks in half, it's twins with same gender. If a egg breaks in half before a sperm gets in, then two sperms can get into the two half eggs and thay'll have a different gender, but still twins. So there it is. Please thank me for I'm a guest.
Twins formed by the fertilization of two ova by two sperm are?
They would be fraternal twins. Identical twins are created when one sperm fertilized one egg, and hat egg then splits in two. Identical twins are always the same gender, while fraternal twins can be either gender, or a mix of the two.
Is there an X or Y chromosome in an egg?
An egg will have the X chromosome and the sperm will have an X or Y chromosome.
