The term 'gene' was coined by

$F_1$ generation Mendel pollinated a pure-breeding tall plant with a pure-breeding dwarf plant. But for getting the $F_2$ generation,he simply self-pollinated the tall $F_1$ plants. Why?

What is the common test to determine the genotype of a hybrid?

The synthesis of starch in pea seeds is controlled by a single gene. This gene has two alleles,$B$ and $b$. If the shape of the pea seed is considered as the phenotype,what type of inheritance does this represent?

Blue-flowered and white-flowered plants on crossing gave progeny of blue and white-flowered in the ratio of $60 : 40$. What ratio of blue and white is expected if the blue-flowered plants are self-pollinated?

Mendel's work remained unrecognized for a long time due to:
$I.$ Communication was not easy.
$II.$ The concept of factors which did not blend was not accepted.
$III.$ The use of mathematics to explain biological problems was unacceptable.
$IV.$ He could not provide any physical proof for the existence of factors.
Choose the right combination.