Homo means same so in a Punnett square, if one organism's gene is either BB or bb- the same- it is homozygus. When it is heterozygus, it would be Bb- or different 2 genes. Homozygus is an individual having two identical alleles of a particular gene or genes and so breeding true for the corresponding characteristic.
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It is when two animals have children and the offspring looks strikingly similar to the parents.