QQuestion
What is the numerical ratio of the four genotypes BBRR, BBrr, bbRR and bbrr produced in the F2-generation resulting from dihybrid cross in Guinea pig?
(a) 1 : 1 : 1 : 1
(b) 2 : 4 : 2 : 4
(c) 4 : 2 : 2 : 1
(d) 2 : 4 : 1 : 2
✓Answer
(a) 1 : 1 : 1 : 1
Explanation:
| BR | Br | bR | br | |
|---|---|---|---|---|
| BR | BBRR (Black Rough) | BBRr (Black Rough) | BbRR (Black Rough) | BbRr (Black Rough) |
| Br | BBRr (Black Rough) | BBrr (Black Smooth) | BbRr (Black Rough) | Bbrr (Black Smooth) |
| bR | BbRR (Black Rough) | BbRr (Black Rough) | bbRR (White Rough) | bbRr (White Rough) |
| br | BbRr (Black Rough) | Bbrr (Black Smooth) | bbRr (White Rough) | bbrr (White Smooth) |
BBRR, BBrr, bbRR and bbrr = 1 : 1 : 1 : 1
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