Punnett square is a square representation to understand the Mendel’s cross.
It predicts all the genotypes (combination of alleles) and phenotype (the traits which can be observed) of offspring from a particular genetic cross.
In this cross, the homozygous (gene with same alleles) Parent generation TT and tt split into gametes T, T and t, t respectively and this result into the formation of Heterozygous (gene with different alleles) F1 generation. The F1 generation further splits into T, t gametes and when two members of F1 generation were crossed, it resulted into F2 generation which contains 2 homozygous plants i.e. TT and tt and 2 heterozygous plants i.e. Tt.
Also it can be seen that a recessive trait expresses itself only when two heterozygous plants are crossed.
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