In a cross between white-flowered parents,F_1 | vedclass

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(A) The phenotypic ratio of $9:7$ in the $F_2$ generation is a classic modification of the Mendelian dihybrid ratio $(9:3:3:1)$.This specific ratio oc

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Two genes

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(A) The phenotypic ratio of $9:7$ in the $F_2$ generation is a classic modification of the Mendelian dihybrid ratio $(9:3:3:1)$.This specific ratio occurs due to complementary gene interaction,where two independent genes interact to produce a single phenotype.In this case,both dominant alleles must be present for the purple colour to be expressed; otherwise,the flowers remain white.Therefore,the flower colour is controlled by two genes.

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

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