what is homozygosity.

As the etymology of the word homozygous suggest homo means two of the same thing and zygous means genes. Hence, homozygous means having the same alleles at a particular gene locus on homologous chromosomes. Thus, homozygosity can be defined as the state of being homozygous (having two identical alleles of the same gene.) For example, a dwarf plant with genotype tt will be homozygous and this state is called the homozygosity.