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Twins (monozygotic twins)

- A single ovule is released and stylized by a single sperm

- The union forms a zygote that divides into two, forming two identical embryos

- Which results in two brothers always of the same sex and DNA

Cuates (dizygotic twins)

- Two or more ovules are released and a different sperm fertilizes each ovule

- Each Union forms its own zygote and these do not divide they only become two embryos

- The result is two brothers who can be of different sex and who only share 50% of their DNA and because each one is independent