Question

When Mendel crossed plants that were heterozygous.

Answer 1

When two heterozygous plants are crossed by Mendel, he got plants with two phenotypes i.e. 3/4^th of the progenies showed dominant characters and 1/4^th progenies showed recessive characters.

But three different genotypes were observed, i.e. 1/4^th of the progenies were homozygous dominant, 1/4^th were homozygous recessive and 2/4^th of the progenies were heterozygous dominant.