A dihybrid ratio of \( 1: 4: 6: 4: 1 \) is obtained instead of \( 9: 3: 3: 1 \). This is an exam...

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A dihybrid ratio of \( 1: 4: 6: 4: 1 \) is obtained instead of \( 9: 3: 3: 1 \). This is an example of:
(a) Complementary genes
(b) Supplementary genes
(c) Polygenic inheritance
(d) Pleiotropic genes
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