Pertanyaan
4. Disilangkan kucing berbulu halus warna kuning (HHKK) dengan kucing berbulu kasar (hhkk)menghasilkan keturunan F1 semua kucing berbulu halus warna kuning (HhKk). Bulu halus dominan terhadap bulu kasar, dan warna kuning dominan terhadap warna putih. Dengan membuat diagram persilangan tentukanlah rasio genotipe dan fenotipe pada F2 jika F1 disilangkan dengan sesamanya.
Jawaban
Diagram Persilangan F1 x F1
Genotype F1: HhKk
Gamet F1: HK, Hk, hK, hk
Diagram Persilangan:
| | HK | Hk | hK | hk |
|-------------|--------|--------|--------|--------|
| HK | HHKK | HHKk | HhKK | HhKk |
| Hk | HHKk | HHkk | HhKk | Hhkk |
| hK | HhKK | HhKk | hhKK | hhKk |
| hk | HhKk | Hhkk | hhKk | hhkk |
Rasio Genotipe F2:
* HHKK: 1
* HHKk: 2
* HhKK: 2
* HhKk: 4
* HHkk: 1
* Hhkk: 2
* hhKK: 1
* hhKk: 2
* hhkk: 1
Rasio Fenotipe F2:
* Bulu halus, warna kuning: 9
* Bulu halus, warna putih: 3
* Bulu kasar, warna kuning: 3
* Bulu kasar, warna putih: 1
Kesimpulan:
Dari persilangan F1 dengan sesamanya, diperoleh rasio genotip F2 yaitu 1:2:2:4:1:2:1:2:1 dan rasio fenotip F2 yaitu 9:3:3:1.
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