$A$ : Pseudoalleles are actually closely linked genes.
$R$ : These can be identified easily as both affect different characters, providing separate phenotypes

Alkaptonuria is caused due to

$A$ : One drum stick per nucleus is present in the neutrophil of normal female.
$R$ : It is absent in the neutrophil of male

In which of the sex determination both male and female have same number of chromosomes?

___$(B)$___ 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

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