What is the genotypic ratio of the $F_2$ generation in Mendel's dihybrid cross?

During a dihybrid cross, in the $F_2$ generation, the ratio of individuals showing one dominant and the other recessive character will be . . . . . . of the total population. (in $/16$)

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

In a plant,red fruit $(R)$ is dominant over yellow fruit $(r)$ and tallness $(T)$ is dominant over shortness $(t)$. If a plant with $RRTt$ genotype is crossed with a plant that is $rrtt$,what will be the phenotypic ratio of the offspring?

In a dihybrid cross between $AABB$ and $aabb$,the ratio of $AABB, AABb, aaBb,$ and $aabb$ in the $F_2$ generation is:

$A$ human male produces four types of gametes $AB, Ab, aB,$ and $ab$ in equal proportions. What is the corresponding genotype of this individual?