In Mendel's dihybrid cross,how many seeds out of the $F_2$ generation ratio of $9:3:3:1$ were found to be round?

If the genotype of an organism for two pairs of genes is represented by $AaBb$,then the possible genetic combinations of gametes after meiosis will be:

$A$ human male is heterozygous for autosomal genes $A$ and $B$ and is also hemophilic (gene $h$). What proportion of his sperm will contain the $abh$ gene combination?

In humans,a male produces sperm with genotypes $AB, Ab, aB,$ and $ab$. What would be the genotype of this individual?

In a dihybrid cross between $AABB$ and $aabb$,the $F_2$ generation produces offspring with genotypes $AABB$,$AABb$,$AaBB$,and $AaBb$. What will be their phenotypic ratio?

In a dihybrid cross,what is the proportion of $RrYy$ offspring obtained from the selfing of an $RrYy$ plant (in $/16$)?