Which of the following is heterozygous for two pairs of alleles?

In a dihybrid cross experiment,what is the phenotypic ratio obtained from the test cross of $F_1$ generation plants?

$A, B, D$ are three independently assorting genes with their recessive alleles $a, b, d$,respectively. $A$ cross was made between individuals of $Aa bb DD$ genotype with $aa bb dd$. Find out the types of genotypes of the offspring produced.

$A$ dihybrid condition is represented by:

In Mendel's dihybrid cross experiment,what was the phenotype of the $F_1$ generation that was self-pollinated?

In Mendel's dihybrid cross experiment,what is the number of offspring with the $RRYY$ genotype in the $F_2$ generation?