Study the following.

I.	Codominance	1 : 2 : 1	Phenotypic ratio
II.	Dihybrid test cross	1:1:1:1	Genotypic ratio
III.	Incomplete dominance	1 : 1	${\text{F}}_1$progeny
IV.	Monohybrid cross	3 : 1	${\text{F}}_{\text{2}}$genotypic ratio

The correct combination is 

In incomplete dominance, all ${\text{F}}_1$ progeny are one type i.e., pink  (Rr ) 

F₂ progeny 25% red , 50 % pink and 25% white 

phenotypic and genotypic ratio of F₂  progeny of incomplete dominance is 1:2:1

Monohybrid cross phenotypic ${\text{F}}_{\text{2}}$ ratio is 3 : 1, genotypic ratio 1:2:1 .