Two individuals with similar external appearance but different genetic make up have the similar
A.Genotype – it is the representation of an individuals genetic constitution with respect to a single character or a set of characters.
B.Phenotype – It is observable morphological appearance.
C.Heterozygote – Organisms phenotypically similar but genotypically different.
d.Homozygote – Organisms phenotypically similar genotypically similar.
So, the correct option is ‘Phenotype’.