Who proposed the term 'Allelomorph'

___$(B)$___ used the frequency of recombination between gene pairs on the ___$(A)$___ as a measure of the distance between genes and mapped their position on the chromosome

$(A) \;\;\quad\;\;(B)$

Experimental evidence of chromosomal theory of inheritance was given by

In which of the following disorder a single protein that is a part of the cascade of proteins involved in blood clotting is affected?

A hereditary disease, which is never passed on from father to son is

$A$ : Holandric traits are passed from one generation to the next generation.
$R$ : These traits appear more frequently in one sex than in other.