The phenomenon of incomplete dominance was observed by whom?

The plant that does not follow Mendelian inheritance is:

$A$ grey-feathered chicken is crossed with another chicken of the same phenotype. The offspring are $15$ grey,$6$ black,and $8$ white. What will be the phenotype of the offspring produced by selfing the grey chickens and the black chickens from their progeny?

In a cross between red and white flowered snapdragon ($Antirrhinum$ $sp.$),the $F_2$ generation has red,pink,and white flowered plants in the ratio of:

Incomplete dominance is shown by

What is the phenotypic ratio obtained in the $F_2$ generation of a snapdragon plant in a monohybrid cross?