Question

Define homozygus and heterozygus

Answer 1

Homozygus- same structure but different functions.
             ex- forelimbs of human being and forelimbs of birds

Hetrozygus- different structure but same function.
               ex- wings of birds and wings of insects.

Answer 2

Homozygous :  describes a genotype consisting of two identical alleles at a given locus or it is the diploid condition in which the alleles at a given position on a chromosome are identical.
Heterozygous: describes a genotype consisting of two different alleles at a locus
or it is the diploid condition in which the alleles at a given position on a chromosome are different.