How many types of gametes are produced by a plant with the genotype $Rryy$?

What will be the phenotypic ratio obtained from the selfing of a plant with the genotype $AABb$?

In a cross between plants with red and white flowers,the ratio of red to white flowered plants in the $F_2$ generation was $60:20$. If a heterozygous red-flowered plant is self-pollinated,what will be the ratio of the progeny?

When Mendel crossed a true-breeding white-flowered strain of peas with a true-breeding red-flowered strain,the individuals in the $F_2$ generation represented:

If a cross is made between $AA$ and $aa$,the $F_1$ progeny will be...

$A$ black dog heterozygous for the colour is crossed with a white bitch,which is recessive homozygous. The progeny will show black to white offspring in the ratio of: