Barr body in mammals represents
All the heterochromatin in female cells
One of the two $X$-chromosomes in somatic cells of females
All the heterochromatin in male and female cells
The $Y$-chromosome in somatic cells of male
___$(B)$___ 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
$(A) \;\;\quad\;\;(B)$
The term "genotype'' was coined by
If mother and father both are without pigments $(albinism)$, then
Phenylketonuria is an inborn error of metabolism that is inherited as
Mongoloid condition is related to or In mongolism a patient shows