The dwarfness in plants of $F_2$ generation is

What is the probability of a couple having three daughters in their three children?

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.

An inherited factor that determines a biological characteristic of an organism is called

Which of the following is $NOT$ one of the seven pairs of contrasting traits studied by Mendel in pea plants?

$A$ gene that expresses itself in a heterozygous condition and shows its characteristic is called a...