Who worked on the poky strain of $Neurospora$?

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

Extranuclear inheritance is observed in .......... .

$A$ gene that suppresses the effect of another gene,and which is not located at the same locus on homologous chromosomes,is called:

When two non-allelic genes are present together,they produce a new phenotype,but when they are separated,they do not show this effect. This is called: