Answer:
Centromere is a narrow non-stainable area, which
join two similar threads or chromatids of a late prophase or metaphase
chromosome. The two parts of the chromosome on either side of the centromere
are known as arm. They may be isobranchial (equal) or helerobranchial (unequal
in length). Depending upon the position of the centromere, the chromosomes are
classified as follows
(i) Acrocentric chromosome Centromere
sub-terminal, anaphasic stage J-shaped.
(ii) Sub-metacentric chromosome The
centromere is sub-median and the anaphasic chromosome appear L-shaped.
(iii) Metacentric chromosomes The centromere
is in the middle and the chromosome appears V-shaped.
(iv) Telocentric chromosome Centromere is
terminal, anaphasic stage is I-shaped.
Depending upon the number of centromeres a
chromosome possess, it may be monocentric, dicentric (two centromeres),
polycentric (many centromeres), acentric chromosome (having no centromere).
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