Which one of the following is not a mutagen
Ethyl methane sulphonate
Acetic acid
Nitrous acid
Ethylene oxide
Continuous variations are attributed to
Sex influenced characters are due to
Polytene chromosomes in salivary glands of are formed as a result 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
The gene, which controls many characters, is called