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4.Principles of Inheritance and Variation
normal
In a cross between white-flowered parents, $F_1$ progeny was uniformly purple-flowered. The $F_2$ progeny showed a phenotypic ratio $9 : 7$ between purple-flowered and white-flowered plants. The above result indicates that the flower colour is controlled by
A
Two alleles
B
One allele
C
Three alleles
D
Four alleles
Solution
(a) This is an example of complementary genes.
Standard 12
Biology