Question

How are chromatin, chromatid and chromosomes are retailed to each other

Answer 1

Chromatin is a mass of genetic material composed of DNA and proteins which is found in the interphase of the cell cycle. And chromatin condenses to form chromosomes. So chromosomes are just condensed form of chromatin found in the mitotic phase of the cell cycle (It is more organised than chromatin). Each chromosome (unreplicated form) consists of one chromatid. OR by definition Either of the two daughter strands of a replicated chromosome that are joined by a single centromere and separate during cell division. 

Answer 2

Chromatin is the uncondensed chromosomes found in the form of fibres which are long and thin.These fibres condense to form chromosomes.
Chromatids are the parts of Chromosomes joined by a centromere.
Chromosomes are short and thick structures where the DNA is stored.It is found in the nucleus of the cell.
In the figure the whole structure is the chromosome.
The red arrow represents the chromatids.
The green arrow represents the centromere.
In the 2nd figure the whole structure is the cell.
Inside it is the nucleus and inside it is chromatin fibres.