Mengapa Bayi Bisa Kembar?

Bayi kembar, ada dua macam, yaitu:
1. Kembar identik (monozygotic). Terjadinya karena setelah ovum dibuahi, lalu terbelah jadi 2. Masing-masing bagian mendapat 100% gen orang tuanya. Bayi yang dihasilkan akan identik secara kelamin dan genetik. Juga sidik jari dan kaki yang serupa
2. Kembar Fraternal (dizygotic). Terjadinya, 2 ovum pada saat yang sama, dibuahi oleh 2 sperma. Masing-masing mendapat 50% gen orang tuanya. Bayi yang lahir, tidak harus mirip. Jenis kelaminnya bisa sama bisa tidak.
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