The expression of only one parental trait in $F_1$ and the expression of both parental traits in $F_2$ can be explained by $ . . . . . . $.

According to Mendel,the genes for two traits are located on:

When two pairs of traits are combined in a hybrid, the segregation of one pair of characters is independent of the other pair of characters. This is known as the .....

Which of the following laws was proposed by Mendel?

Which one of the following can be explained on the basis of Mendel's Law of Dominance?
$A$. Out of one pair of factors one is dominant and the other is recessive.
$B$. Alleles do not show any expression and both the characters appear as such in $F_2$ generation.
$C$. Factors occur in pairs in normal diploid plants.
$D$. The discrete unit controlling a particular character is called factor.
$E$. The expression of only one of the parental characters is found in a monohybrid cross.
Choose the correct answer from the options given below:

What is the cross between the progeny of $F_1$ and the homozygous recessive parent called? How is it useful?