What is mean by 2c or 4c

in DNA duplication & increase in chromosome number??

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@ toshika
actually what happens when the dna replication starts , the dna molecule function as a template and form carbon copies .
thats the dna contains will double from 1C TO  2C in the case of haploid cells . 
and in the case of diploid cell , it will grow from 2C to 4C . 
as a result duplicate set of genes are formed. 
HOPE IT CLEARS YOUR DOUBT 

ALL THE BEST ..

HI DEAR

ACTUALLY C IS THE UNIT OF DNA MEASUREMENT . YOU CAN CALL IT AS PICOGRAM. AS WE MEASURE THINGS IN KILOGRAM , DNA IS MEASURED IN PICOGRAM {c}.

WHEN DNA CONTENT DOUBLES WE CALL IT AS DNA CONTENT HAS CHANGED FRON 2C TO 4C.

IT OCCURS AT TIME OF DIVSION. NOTE THAT CHROMOSOME NUMBER STILL REMAINS SAME . ONLY DNA CONTENT IS DOUBLEB

APPROVE MY ANSWER . POST IF STILL SOME DOUBT EXIST IN MIND

Unduplicated Chromosome before S phase of inter phase is a 2C chromosome. Duplicated chrome some in S Phase is a 4C Chromosome