Question

In the second generation ,the dwarf trait reappears during mandel's experiment in monohybrid cross.Why?

Answer 1

In mendelian inheritance pattern, one trait is dominant and another is recessive. Recessive trait cannot express itself in presence of dominant traitbin 1st generation but this 1st generation plants, gene (allele) is present in their genome.

When this 1st generation plants start to produce gametes, the recessive allele move to one gamete and dominant allele to another gamete.

So when male gamete containing recessive allele fuse with the recessive allele of female gamete for same trait in the second generation, the allele combination will become fully recessive and make the phenotype dwarf for the plant height character. In other words recessive trait development is only possible in its homozygous condition.

So dwarf trait reappears during second generation in Mendel's Monohybrid cross.