In ${\mathrm{F}}_2$ hybrid, to check the tall plant is homozygous or heterozygous, which cross is performed?

Which of the following refers to back cross?

A cross between individual with unknown genotype for a particular trait with a recessive plant for that trait is called

$\mathrm{RR}$ red flowered & plant of Mirabilis is crossed with $\mathrm{rr}$ (white) flowered plant of Mirabilis. All the $\mathrm{Rr}$ offsprings are pink. This is an indication that the $\mathrm{R}$ gene is

Multiple alleles of a gene always occupy

Blood grouping in humans is controlled by

Which of the following is an example of pleiotropy?

A marriage between two carriers of sickle cell anaemic gene will result into

The phenotypic ratio of red $\left(\mathrm{AABB}\right)$ and white $\left(\mathrm{aabb}\right)$ kernel in ${\mathrm{F}}_2$ generation showing polygenic inheritance is