In a monohybrid cross,if you get a $3:1$ ratio,it denotes that:

$A$ heterozygous tobacco plant for albinism is self-pollinated,and $1200$ seeds are subsequently germinated. How many of the offspring will have the parental genotype?

If a dwarf plant is treated with gibberellin,it becomes tall. If this plant is now crossed with a pure tall plant,what will be the progeny of the $F_1$ generation?

What is the phenotypic ratio obtained from a test cross of $F_1$ progeny in a monohybrid cross?

$A$ cross was made between a pure tall and a pure dwarf pea plant to produce progeny. The progeny was self-pollinated. Find the ratio of the resulting true-breeding tall and dwarf plants.

$A$ true-breeding plant producing red flowers is crossed with a pure plant producing white flowers. The allele for the red color of the flower is dominant. After selfing the plants of the first filial $(F_1)$ generation,what would be the proportion of plants producing white flowers in the progeny?