In a testcross,if all the offspring show the dominant phenotype,then the individual with the unknown genotype was:

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If all the offspring show the dominant phenotype, it means that the individual with the unknown genotype contributed a dominant allele. Homozygous dominant individuals have two copies of the dominant allele and will always pass on the dominant allele to their offspring, thus, all offspring showing the dominant phenotype indicates that the unknown individual was homozygous dominant.

In a Testcross,if All the Offspring Show the Dominant Phenotype,then