In polygenic inheritance, a trait is controlled by two pairs of genes. Two individuals which are heterozygous for both genes, crossed each other, such type of cross produces what phenotypic ratio?
- A1: 2: 1
- B9: 3: 3: 1
- C1: 4: 6: 4: 1
- D1: 6: 15: 20: 15: 6: 1
✓ Correct answer: C
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