Answer :
F1 generation only showed the Dominant trait.
All the peas of F1 generation have heterozygous genotype like for seed shape Rr genotype. All the zygotes received one R allele (from the round seed parent) and one r allele (from the wrinkled seed parent). Because the R allele is dominant to the r allele, the phenotype of all the seeds was round. The phenotypic ratio in this case of Monohybrid cross is 1.
Each pair of alleles for each attribute is carried by a different set of parents in a dihybrid cross. the parental generation contains the homozygous dominant and recessive allele. After their cross, all the offspring are heterozygous dominant.
Mendel took a pair of contrasting traits together for crossing, for example color and the shape of seeds at a time. He picked the wrinkled-green seed and round-yellow seed and crossed them. He obtained only round-yellow seeds in the F1 generation. This can clearly indicate that round shape and yellow color of seeds are dominant over wrinkled and green.
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