NCERT-Biology
68. Find out the incorrect statement about secondary
constriction -
(1) Non staining
(2) Constant position
(3) Known as satellite
(4) Present in some chromosomes
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The correct statement about secondary constriction is "Non-staining secondary constrictions present in some chromosomes is known as satellite".
- Secondary constrictions are the narrow, constricted regions found in chromosomes.
- It cannot be confused with pimary constriction since the primary constriction is found from prophase onwards. Secondary constriction apperas in anaphase generally.
- Primary constriction is surrounded by kinetochores while they are absent in secondary constriction.
- the secondary constrictions that cannot be stained and are at a constant positions in some chromosomes are known as satellite.
- satellite DNA donot code for any protein and are highly repetitive sequences.
Therefore, the correct statment is non- staining secondary constrictions present in some chromosomes is known as satellite.
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