The number of phenotypic recombinant offspring formed during the $F_2$ generation of a dihybrid cross is . . . . . . . (in $1/16$)

In plants,red color $(R)$ is dominant over yellow $(r)$ and tallness $(T)$ is dominant over dwarfness $(t)$. If a plant with genotype $RRTt$ is crossed with a plant with genotype $rrtt$,what will be the result?

In humans, brown eyes $(B)$ are dominant over blue $(b)$ and dark hair $(D)$ are dominant over red hair $(d)$. A man with brown eyes and red hair marries a woman with blue eyes and dark hair. They have two children; one resembles the man (brown eyes, red hair), and the other resembles the woman (blue eyes, dark hair). What are the genotypes of the man and the woman?

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

When a tall plant with round seeds $(TTRR)$ is crossed with a dwarf plant with wrinkled seeds $(ttrr)$,the $F_1$ generation consists of tall plants with round seeds. How many types of gametes will the $F_1$ generation plant produce?

In a dihybrid cross,$80$ plants are obtained. The ratio of homozygous and heterozygous plants shall be: