In a dihybrid cross,the $F_2$ generation ratio of $15:1$ is the result of:

In poultry,the new comb colour that appears by the collaboration of two dominant genes is:

When certain traits are inherited only from the mother,it is likely a case of .....

The ratio of $9:7$ is obtained as a result of:

Pattern baldness,moustaches and beard in human males are examples of

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