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How can it be determined whether the parent progeny is homozygous or heterozygous?

How can it be determined whether the parent progeny is homozygous or heterozygous? Correct Answer Test cross

Test cross is the cross of a F1 generation offspring with the homozygous recessive parent. If the offspring phenotype is dominant: recessive = 1:1, the F1 offspring is heterozygous dominant. If all the plant exhibits dominant phenotype, the F1 offspring is homozygous dominant. In this way, the genotype of an offspring can be determined.

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