In which one of the following, complementary gene interaction ratio of $9: 7$ is observed?

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

In plants,the gene for cytoplasmic male sterility is generally located in which of the following?

Which of the following is an example of an inhibitory gene?

The antibiotic commonly used to induce mutations in cytoplasmic genes is.....

When a trait is inherited only from the female parent,it primarily indicates: