Which genotype characterises an organism that is heterozygous for two genes?

$A$ dihybrid plant produced by self-pollination yields $400$ seeds with $9$ different genotypes. How many seeds will have the $TtRr$ genotype?

Analyze the given Punnett square. If yellow and round seed alleles are dominant over green and wrinkled seed alleles,which plant will the seeds produced by the plant of genotype $G$ resemble?

$A$ 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.

If the cross is $Aabb \times aaBb$,what will be the genotypic ratio of the offspring?

Which traits did Mendel consider for his dihybrid cross experiment?