Mating of an organism to double recessive for determining homozygosity or heterozygosity is
A.Reciprocal cross - A cross, with the phenotype of each sex reversed as compared with the original cross, to test the role of parental sex on inheritance pattern is called Reciprocal crosses.
B.Back cross – A cross is made between F1 hybrid and any one of the parent is called Back cross or out cross.
C.Dihybrid cross – A cross is made between two parents on the basis of two contrasting traits is called dihybrid cross.
D.Test cross - A cross is made between hybrid and homozygous recessive individual is called Test cross. It is used to determine, whether it is homozygous or heterozygous and also type of gametes produced during fertilization.
So, the correct option is ‘Test cross’.