

ipa kelas 9
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Science
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3rd Grade
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Hard
sri indayani
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PEWARISAN SIFAT
Oleh SRI INDAYANI, M.Pd.

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Amatilah gambar disamping. Perhatikan persamaan dan perbedaan fisik dalam keluarga tersebut!
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Ada beberapa sifat yang sama antara orang tua dan anaknya. Sifat yang sama ini berarti diturunkan dari orang tua kepada anaknya. Ilmu yang mempelajari pewarisan sifat disebut GENETIKA. Pembawa pewarisan sifat adalah kromoson dan penentu sifatnya adalah gen.
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Gen terdapat di dalam kromosom. Kromosom terdapat di dalam inti sel.
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Kromosom ada 2 macam yaitu:
- kromosom tubuh (autosom berfungsi untuk menentukan ciri-ciri tubuh. Pada manusia terdapat 46 kromosom atau 23 pasang kromosom. 46 kromosom berasal 23 dari ayah dan 23 dari ibu.
- Kromosom kelamin (gonosom) yaitu berfungsi untuk menentukan jenis kelamin. Sel kelamin manusia ada 23 kromosom.
PEWARISAN SIFAT
Oleh SRI INDAYANI, M.Pd.

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