In $Pisum$ $sativum$,there are $14$ chromosomes. How many pairs with different chromosomal composition can be prepared?

Match the following (Column-$I$ with Column-$II$):

Column-$I$	Column-$II$
$a$. Allele	$i$. Two alleles of a gene are identical
$b$. Genotype	$ii$. An individual having two different alleles of a gene
$c$. Homozygous	$iii$. Genetic constitution of an organism
$d$. Heterozygous	$iv$. Alternative forms of a gene

Which of the following points strengthened Mendelism?

Mendelism was rediscovered by:
$I.$ Morgan
$II.$ De Vries
$III.$ Correns
$IV.$ Tschermark
Choose the correct option.

In a monohybrid cross of plants with red and white flowered plants,Mendel got only red flowered plants. On self-pollinating these $F_1$ plants,he got both red and white flowered plants in a $3:1$ ratio. Explain the basis of using $RR$ and $rr$ symbols to represent the genotype of plants of the parental generation.

Which of the following did Mendel select for his experiments?