To determine the different types of gametes produced by a pea plant with the genotype $AaBb$,with which genotype should it be crossed?

In a cross between yellow round $(YYRR)$ and pure breeding pea plants having green wrinkled $(yyrr)$ seeds,find out the total number of seeds (plants) having yellow colour in the $F_2$ generation out of $16$ offspring.

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?

What type of gametes will be formed by the genotype $RrYy$?

How many types of gametes and in what ratio will be produced by a dihybrid heterozygote?

When tall plants with red flowers were crossed with dwarf plants having white flowers,Mendel found the phenotypic ratio of the $F_2$ progeny to be: