What are the similarities between homozygus and heterozygus

If you are speaking of genetics, the only real similarity between the two is that they are terms used to describe alleles that are found on a particular gene. If you have homozygous alleles, then both of them are the same. If you have heterozygous alleles, then the two of them are different.

Used to describe alleles that are found on a particular gene. 

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