Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration, is called

Definitions / Explanation : Heterozygous
 

If a cross is made between $AA$ and $aa$, the nature of ${F_1}$ progeny will be

Organisms phenotypically similar but genotypically different are said to be

The crossing of a homozygous tall plant with a dwarf in $F2$ would yield plants in the ratio of