what is the difference in the representation of genotypes of gametes and genotypes of zygote in punnett square

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Solution

Gamete genotype is represented by single allele of a particular trait like T or t where as zygote genotype is represented by pair of alleles of a particular trait like Tt or TT or tt.
In case of two traits, gamete genotype is represented as TR or Tr or tR whereas zygote genotype is represented as TtRr or TTrr or TtRR or TTRr.

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