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Depends. You can do a statistical test that will tell you what the odds are of you getting all tessera offspring (say 15/15) by chance alone under the assumption that your potential homo tessera is in fact just heterozygous. We usually would reject the hypothesis that the animal is het tessera if there is only a 5% or less chance that we could get our result (ie all tesseras in a clutch of 15) by chance alone.
Indeed, the odds of getting 15 tesseras out of 15 eggs if your tessera parent is only het tessera is FAR less than 5%, so that result would be considered conclusive.
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