Formation of Twins (1)

Biology

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Formation of Twins (1)

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Twins

Refer to two or more children that are born from one pregnancy

Two types of twins

Identical twins and fraternal twins

Identical twins

Twins who share the same placenta lead to the same appearance and gender

Fraternal twins

Twins that have their own placenta and give the possibility of different sexes of the twins

Differences identical and fraternal twins

Identical twins fertilize one ovum and one sperm but for fraternal twins it fertilize two ovum and two sperm

Conjoined twins

Identical twins who have physical or organs that are still attached together after birth

Development of conjoined twins

Develop when there is incomplete division of the embryo in identical twins

Characteristics of conjoined twins

Typically the chest, abdomen or back of the twin partner will be attached, possibly even sharing one or two internal organs

Differences identical and fraternal twins

The genetic content and physical properties of identical twins are the same because they develop from the same zygote, in contrast to fraternal twins who have different zygotes

Sex of both identical twins

Identical twins must each have the same sex as it involves fertilization from the same one ovum and one sperm

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