In the $F_2$ generation of a dihybrid cross,how many types of genotypes are produced?

Which genotype represents a true dihybrid condition?

$A$ pure breeding pea plant with round yellow seeds was crossed with a pea plant having wrinkled green seeds. On selfing of the $F_1$ hybrid of this cross,$64$ progenies were obtained in the $F_2$ generation. Find out the number of $F_2$ progenies showing non-parental characters.

In plants,red color $(R)$ is dominant over yellow $(r)$ and tallness $(T)$ is dominant over dwarfness $(t)$. If a plant with genotype $RRTt$ is crossed with a plant with genotype $rrtt$,what will be the result?

Pure homozygous offsprings in a dihybrid cross in the $F_2$ generation will be

In Mendel's dihybrid cross experiment,what is the phenotypic ratio of the progeny obtained from a test cross of the $F_1$ generation?