science behind the birth of twins?

Answer 1

The development of twins.

A single ovum is released from the ovary.

The ovum is fertilised by one sperm.

The zygote divides to form an embryo.

The embryo splits into two identical embryos.

Each embryo completes its development.

So, twins are identical because they each contain copies of the same set of genes.

Answer 2

There are 2 types of twins identical and fraternal.

Fraternal twins are when you have 2 diffrent eggs that are fertilized by differnt sperm at the same time. When one twin is male and the other is female this is what has happened.

Identical twins is when one egg is fertilized by one sperm and during the developmental process of the zygote it splits in to 2 to become to separate embryos, but with identical DNA.

Answer 3

Identical twins are one original egg and sperm that divided for some reason (unknown) to carry on development as two seperate entities. They are always the same sex.

Fraternal (non-identical) twins come from mothers who release two eggs monthly rather than one. Both eggs get fertilised and develop as two seperate entities. They can be the same or different sexes.

Answer 4

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Answer 5

the answer above mine is correct....but that is not the only possible cause....

it may happen that two eggs are fertilised by two separate sperm cells..in tht case the twins wud be called fraternal twins...n may of different sex even...let alone the looks...

in the answer above...u will get what are called identical twins...the same sex..n to a large extent...similar looks...
behaviour however maybe on the two poles of our planet....

hope tht answers ur question...ciao!

Answer 6

Conjoined twins (Siamese twins is no longer used as a term to describe this) arise from the egg-splits-in-two scenario, not from the two- separate-eggs scenario. i.e. they are always identical.

Answer 7

twins simply develop when a fertilised egg splits into two and both parts grow separately

Answer 8

2 egges fertalized at the same time or one egg splits into two
the result two babys ie twins

Answer 9

Have a look at :

http://www.babyworld.co.uk/information/pregnancy/twins/why_twins_identical.asp

Answer 10

In females..each ovary usually produces ovum alternately...but in very rare cases, both the ovaries produces ovum at the same time......thus both can gett fertilise.....and twins can come ....this may be the reason...