How many types of genotypes are produced in the $F_2$ generation obtained from a dihybrid self-cross?

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?

From a cross $AABb \times aaBb$,the genotypes $AaBB : AaBb : Aabb : aabb$ will be obtained in the following ratio:

How many types of gametes will be produced by a genotype $AABbCc$?

In a typical Mendelian dihybrid cross,one parent is homozygous for both dominant traits and another parent is homozygous for both recessive traits. In the $F_2$ generation,both parental combinations and recombinations appear. The phenotypic ratio of parental combinations to recombinations is